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6th millennium BC

The 6th millennium BC (c. 6000–5001 BC) represented a transformative era in human , primarily within the period, during which farming communities expanded across the , , , and parts of , fostering innovations in , production, and early techniques that supported and sedentary lifestyles. This millennium witnessed the consolidation of the Neolithic Revolution's core elements, including domesticated crops and animals, polished stone tools, and the construction of durable settlements, amid ongoing post-glacial environmental adaptations such as rising sea levels and climatic shifts. Key archaeological evidence highlights regional variations, from aceramic villages in the to the emergence of dairy technologies in temperate , underscoring a period of and technological refinement that laid foundations for later societies. In the and , the 6th millennium BC saw the southward expansion of agricultural settlements along the and rivers, where communities relied on systems to cultivate crops beyond rain-fed limits, leading to the formation of small Ubaid-period villages by c. 6000–5000 BC. innovations proliferated, with Hassuna-style ceramics featuring incised designs appearing around 7000–6000 BC, followed by polychrome Samarra-style vessels with geometric patterns by 6000–5000 BC, often accompanied by early administrative markers like clay seal impressions at sites such as Tell Sabi Abyad. Monumental architecture emerged, exemplified by mud-brick temples at in the late phase, signaling ritual and social complexity, while aceramic sites like in demonstrated dense, circular-house settlements without , supporting up to 300 inhabitants through farming and hunting. In , farming intensified at sites like and Hacılar, with evidence of diverse early cuisines incorporating domesticated plants and animals, amid the transition to traditions influenced by Syrian and Mesopotamian styles. Across , the 6th millennium BC marked the accelerating spread of practices from southeastern origins, with farming and herding reaching central and northern regions, as seen in the Linear Pottery culture's expansion and the establishment of lake-dwelling settlements in the dated precisely via multispecies tree-ring chronologies. In the , pile-dwelling settlements emerged, such as Lin 3 in (c. 5862–5748 BC) and Dispilio in northwestern (c. 5600 BC), constructed with and juniper, reflecting adaptive responses to lacustrine environments and enabling of early farming communities. A major innovation was the processing of dairy products, with perforated potsherds from northern European sites containing fat residues indicating cheese production by the mid-6th millennium BC, which allowed lactose-intolerant populations to consume preserved and integrate it into diets alongside newly domesticated animals. In , neolithization processes unfolded variably, with western Central experiencing a cultural shift around the early 6th millennium BC at sites like Kaynar Kamar Rockshelter in , where archaeological layers reveal the introduction of food production, including domesticated cereals and caprines, alongside local traditions. In eastern regions, such as , agricultural evidence from c. 7000–6000 BC includes millet and , while sites in and show early evidence of flaked stone tools and incipient plant management in pre- Hoabinhian contexts, with ceramics and settlements emerging later around 3000 BC. These diverse trajectories across continents highlight the 6th millennium BC as a of interconnected yet regionally distinct advancements, bridging economies with increasingly complex agrarian societies.

Introduction

Definition and Timeframe

The 6th millennium BC encompasses the calendar years from 6000 BC to 5001 BC, equivalent to roughly 8000 to 7000 years ago from the present. This timeframe positions it firmly within the epoch, the current interglacial period that commenced approximately 11,700 years ago after the conclusion of the Pleistocene and the major phase of global , during which retreating ice sheets allowed for the stabilization of sea levels and warmer climatic conditions conducive to human expansion. Unlike the preceding , which was characterized by the initial dispersal of agricultural practices from core areas in the toward peripheral regions such as the Aegean through maritime networks, the 6th millennium BC represents a period of established and diversifying adaptations across multiple continents. In distinction from the following , where proto-urban settlements and began to emerge notably in northern with features like monumental architecture and specialized production, the 6th millennium maintained a focus on village-based farming communities without widespread . Archaeological chronologies for this millennium depend heavily on , but uncalibrated results can deviate significantly from years due to atmospheric variations in radiocarbon concentration during the early . Calibration curves, such as IntCal20, integrate high-precision data from tree rings and other archives to convert radiocarbon ages to accurate dates spanning this era, mitigating earlier imprecisions and enabling refined temporal resolution for sites up to 6000 BC.

Global Significance

The 6th millennium BC represented a transformative in human , with global accelerating due to the agricultural surpluses generated by early farming communities. By around 5000 BC, the world's human population had expanded to approximately 5-20 million, a significant increase from earlier estimates of 5–10 million at the start of the millennium, as settled supported larger, more stable communities with reduced mortality and higher fertility rates. This era saw the rapid dissemination of Neolithic practices from their origins in the , extending across , , and through a combination of population migrations and cultural exchanges. In , for instance, farming and herding spread via , where early farmers from intermingled with indigenous hunter-gatherers, leading to a profound shift toward sedentary lifestyles and the establishment of permanent villages. Similar patterns of adoption and adaptation occurred in and the , fostering interconnected networks of trade and knowledge that linked diverse regions far beyond their points of origin, underscoring the millennium's role in weaving early threads of global human interaction. The innovations and societal structures emerging during this period provided the foundational bedrock for later civilizations, including the precursors to through surplus-based economies and the development of technologies such as polished stone tools, , and monumental . As outlined, these advancements created the social surplus and essential for the subsequent around 3500–3000 BC, enabling the rise of complex states in , , and beyond. Favorable climatic stability in the early further bolstered this expansion by providing reliable growing seasons across multiple continents.

Environmental Context

Climatic Conditions

The 6th millennium BC (approximately 8000–7000 ) fell within the early stages of the (HCO), a period of relatively warm and stable global temperatures following the end of the Pleistocene glaciation. This phase represented a peak in warming trends for many regions, with average temperatures 1–2°C higher than pre-industrial levels in mid-latitudes, driven primarily by that enhanced summer insolation in the . Warmer conditions were accompanied by increased precipitation in much of the , fostering expanded vegetation zones and higher moisture availability in continental interiors. Post-glacial continued to decelerate during this after more rapid earlier pulses, with global mean approaching within a few meters of modern levels by around 6000 BC. Over the preceding approximately 5,000 years (from roughly 11,000 BC), cumulative eustatic rise totaled about 60 meters, primarily from the melting of residual ice sheets in and , though rates had slowed to 1–2 mm per year by the mid-6th BC. A notable exception was Meltwater Pulse 1C, centered around 8000 (ca. 6000 BC), which involved a rapid influx of causing a global increase of about 6.5 meters over less than 140 years, likely triggered by the final collapse of the Laurentide Ice Sheet's margins. Regional climatic variations were pronounced, reflecting latitudinal and topographic differences. In parts of the , such as the , the tail end of the gave way to localized aridification spikes, influencing the push toward more intensive agricultural practices. In contrast, experienced milder temperatures and relatively wetter summers, promoting the expansion of temperate deciduous forests and mixed woodlands, which in turn facilitated human activities like selective forest clearance for resource exploitation. Volcanic eruptions occasionally imposed short-term local cooling through loading, but these were secondary to the dominant warming trends.

Geological and Volcanic Events

The 6th millennium BC witnessed several significant geological and volcanic events that disrupted regional landscapes and contributed to transient atmospheric changes. In the , the Cueros de Purulla in northwestern underwent a major around 7820 ± 830 , equivalent to 5870 BC, classified as a caldera-forming event with a (VEI) of at least 6. This eruption ejected substantial rhyolitic and ash, forming extensive deposits across the southern Puna region and contributing to one of the largest volcanic events in the . The ash plume's dispersal pattern affected vast areas of southern , with fallout potentially reaching hundreds of kilometers eastward, leading to burial and short-term disruptions in regional ecosystems. Such widespread distribution could have interconnected with hemispheric , influencing distant patterns and for nascent agricultural practices. North America's experienced its climactic eruption approximately 7,700 years ago, or about 5750 BC, resulting in the collapse of the volcano's summit and the formation of caldera in present-day . This VEI 7 event produced a column that lofted and across the , with layers identifiable from the to the and as far as Canada's Territory. flows devastated areas up to 70 km away, while fallout thicknesses exceeded 10 cm in and , smothering vegetation and altering soil properties over thousands of square kilometers. The global reach of finer particles may have contributed to minor hemispheric cooling through stratospheric loading, indirectly affecting moisture availability and early plant productivity in affected regions. Further south, Mount Takahe's eruption in around 5550 BC marked a confirmed explosive and effusive event at this . While specific volumes are not well-quantified, the activity injected aerosols into the upper atmosphere, potentially exacerbating short-term by reflecting radiation. Ash from eruptions like this can disperse poleward and equatorward via atmospheric winds, influencing and contributing to interconnected climatic perturbations. Additionally, a activity anomaly detected via a large radiocarbon (¹⁴C) excursion between 5481 and 5471 BC indicated unprecedented modulation, with Δ¹⁴C spikes up to 20‰ suggesting intense influx and weakened heliomagnetic shielding. This event, distinct from volcanic forcing, may have amplified climatic fluctuations through enhanced formation or ion-induced , linking variability to broader geological environmental dynamics during the millennium.

Near East Developments

Mesopotamia and the Levant

In the during the early 6th millennium BC, the Pottery Neolithic period was characterized by established sedentary villages reliant on cultivated crops and managed animal herds. Emmer wheat (Triticum dicoccum), domesticated earlier in the region, formed a staple alongside other cereals like , supporting permanent settlements such as those at 'Ain Ghazal in central , where multi-phase architecture indicates community growth. (Capra hircus) featured in established herding practices during this period, with evidence from sites showing managed populations that enhanced and mobility. These developments in the southern and northern , including the (c. 6400–5900 BC), fostered social complexity, with rectangular houses and communal structures reflecting organized labor for . In southern , the Early (c. 6500–5000 BC), also known as Ubaid 0, marked the transition to pottery-using societies with proto-urban features. The site of , located near the , exemplifies this era through its sequence of mud-brick temples, beginning with early structures (c. 5400–5000 BC), a simple rectangular platform structure that evolved into more elaborate shrines, signaling early ritual centers and communal investment. At Choga Mami in the Diyala region, excavations reveal the earliest evidence of canal irrigation systems around 6000 BC, enabling on alluvial plains and supporting denser populations through controlled water distribution from nearby wadis. These innovations, including multi-room mud-brick dwellings, laid foundations for larger settlements, as seen in the village layout at Tell Abada, where Ubaid levels I–II (c. 5500–5000 BC) show clustered housing and storage facilities indicative of surplus management. Northern Mesopotamia witnessed the flourishing of the Halaf culture (c. 6100–5100 BC), renowned for its finely painted pottery featuring geometric and zoomorphic motifs in polychrome styles, produced from diverse local clays and likely serving as prestige goods in exchange networks. Architectural hallmarks included circular tholos houses, constructed with mud-brick or tauf on stone foundations, often 5–6 meters in diameter with rounded domes or flat roofs, as uncovered at sites like Tell Sabi Abyad and Arpachiyah; these structures, sometimes with antechambers, suggest specialized functions possibly linked to communal or elite activities. The Halaf extended across the Khabur River basin into southeastern Anatolia, influencing regional interactions. The (c. 6000–5000 BC), centered at Tell Hassuna near modern , represents an early pottery Neolithic phase bridging PPNB traditions and later developments, with villages featuring clustered multi-room houses built initially of and later molded mud-brick. At the , central buildings around 5500 BC indicate emerging social differentiation, while coarse painted wares and evidence of dry farming alongside highlight adaptive subsistence in the northern alluvial zones. This period's village clustering, as observed in over 100 small settlements, facilitated the spread of ceramic technologies and agricultural practices eastward.

Anatolia and the Caucasus

In the 6th millennium BC, the settlement of in central continued its occupation from the preceding millennium, reaching population peaks estimated between 3,500 and 8,000 individuals around 6000–5500 BC during its middle phases, characterized by densely packed mud-brick houses and communal living spaces. This period featured rich symbolic art, including wall paintings of animals, geometric motifs, and human figures that reflected and social complexity, often integrated into domestic to emphasize themes of , , and community identity. These cultural elements underscored Çatalhöyük's role as a highland center bridging lowland Near Eastern agricultural traditions with emerging upland networks. Trade networks in facilitated the exchange of , a prized for tool-making, from central Anatolian sources such as to distant regions including the , with evidence of long-distance distribution across the by the early 6th millennium BC. This commerce not only connected Anatolian highland communities to Levantine coastal sites but also hinted at broader cultural interactions, including the flow of ideas and materials that supported symbolic practices in settlements like . Anatolia and the served as a key migration corridor during this era, where genetic evidence reveals a cline of mixed ancestry among 6th millennium BCE populations, linking northern and central Anatolian groups with those in the southern through movements that facilitated the spread of technologies and lifestyles. In the southern Caucasus, the Shulaveri-Shomu culture flourished from approximately 6000 to 5000 BC across present-day , , and , marked by clustered village settlements featuring round or oval houses built with stone foundations and mud-brick walls, some incorporating defensive enclosures suggestive of fortified layouts. These communities engaged in early agropastoralism, cultivating crops like and herding animals, while hints of —such as artifacts and ore processing residues—appear in later phases, indicating nascent technological experimentation that connected Caucasian highlanders to broader Near Eastern developments. Cultural exchanges along this corridor are exemplified by evidence of wine production near in , where chemical residues in jars from sites like Gadachrili Gora and Shulaveri Gora date to around 5980 BC, representing the oldest known large-scale and involving the of in buried vessels. This practice highlights the region's role in innovating fermented beverages, potentially influencing trade and ritual exchanges with Anatolian and neighbors.

European Developments

Western and Northern Europe

In Western and during the 6th millennium BC, the Mesolithic-to-Neolithic transition was characterized by persistent economies in coastal and forested environments, with gradual incorporation of elements through maritime networks and trade, rather than widespread agricultural adoption. groups adapted to post-glacial landscapes by exploiting abundant , such as and , which supported semi-sedentary settlements along the and Baltic coasts. This period saw the emergence of early traditions among foragers, marking a technological shift without immediate reliance on farming, as evidenced by residue analyses from coastal sites. The , spanning approximately 5400–4000 BC in southern , exemplifies these maritime adaptations, with communities centered on and southern relying heavily on marine exploitation. Archaeological evidence from sites like Tybrind Vig and Ronæs Skov reveals shell middens and fishing implements, indicating intensive use of aquatic resources that comprised up to 55% of dietary biomarkers in pottery residues. Ertebølle pottery, featuring point-based vessels used for cooking, appeared in the late 6th millennium BC and was often deposited in domestic contexts, reflecting a rich foraging lifestyle with minimal integration of domesticated species until later contacts with Linearbandkeramik (LBK) farmers around 4000 BC. These innovations highlight sub-regional patterns where coastal proximity drove specialized subsistence strategies. Further south, the Swifterbant culture, emerging around 5300 BC in the wetlands of the and Lower basin, represents an early phase of neolithization through exchange rather than direct migration. Hunter-gatherers here adopted and small-scale animal management, with evidence of domesticated , sheep, and appearing by 4800–4600 BC, likely obtained via with loess-zone farmers. Isotope analyses from Swifterbant sites confirm limited husbandry practices, where dominated assemblages (about 43%), supplemented by wild resources, underscoring a economy that persisted into the . This gradual process involved , possibly through intermarriage or specialists, facilitating the introduction of cereals like bread wheat without full agricultural transformation. In , the (LBK), emerging around 5500 BC, marked the rapid spread of farming from the into regions such as modern-day , , and the . Characterized by longhouses, polished stone tools, and linear-arranged settlements along loess soils, LBK communities cultivated emmer , einkorn, and , while herding cattle, sheep, goats, and pigs. Distinctive incised and painted , along with evidence of social organization from enclosure systems, highlights the establishment of sedentary agrarian societies adapting to temperate forests. In the western Mediterranean, early human settlement of around 5900 BC laid foundational adaptations for later megalithic developments, with farmers arriving from to exploit island resources. Sites like Ghar Dalam provide the earliest evidence of human presence, featuring domestic structures and tools indicative of a maritime-oriented economy focused on and small-scale farming. These communities established precursors to monumental architecture, as seen in the foundations of later temples like on (built ca. 3600 BC), through initial coastal settlements that emphasized marine and terrestrial foraging amid isolation. Evidence of dairy processing further illustrates emerging influences in the region, with the earliest confirmed cheese-making dated to circa 5500 BC in , . Organic residue analysis of unglazed ceramic strainers revealed milk fat traces from ruminants, suggesting sieving techniques for curdling into cheese, a practice that enhanced and nutrition for semi-mobile groups. This innovation, part of broader interactions, indicates early experimentation with animal products in forested central-western areas, bridging and pastoral economies.

Eastern and Southern Europe

In Eastern and during the 6th millennium BC, the and adjacent steppes witnessed the rapid dispersal of farming practices from the , leading to diverse cultural mosaics characterized by early , distinctive traditions, and emerging symbolic systems. These developments marked a transition from lifestyles to sedentary communities reliant on domesticated plants and animals, with settlements concentrated along river valleys and fertile plains. The region's role in this process is particularly significant, as the spread of farming communities here has been linked in the to the early diversification of Proto-Indo-European languages, potentially originating with Anatolian farmers who reached the around 6200 BC and influenced subsequent linguistic expansions. In northwestern , early pile-dwelling settlements emerged in lacustrine environments, adapting to lake margins with wooden structures. Sites like Dispilio and Lin 3 provide the earliest evidence, with Lin 3 dated precisely to 5862–5748 BC via multispecies tree-ring chronologies from and piles. These constructions supported farming communities cultivating cereals and herding animals, enabling and highlighting technological responses to habitats in the . The Dnieper-Donets culture, centered in the forest-steppe zones of modern from approximately 5300 to 4000 BC, represents a key example of this adaptation in the Pontic-Caspian region. This culture is noted for its burial practices, including pit graves often arranged in cemeteries without mounds in its early phases, though later expressions incorporated kurgan-like structures, and for the production of early ceramics featuring comb-impressed and corded decorations. These ceramics, typically globular vessels with pointed or flat bases, indicate technological continuity from traditions while incorporating innovations like fired clay for storage and cooking. Evidence from sites such as those along the reveals a mixed , blending , fishing, and incipient stockbreeding, with human remains showing dietary shifts toward more terrestrial resources by mid-millennium. Further south in the , the Körös culture (c. 5500–4500 BC) emerged as one of the earliest farming complexes in the and surrounding areas, facilitating the inland expansion of economies. Named after the Körös River, this culture is distinguished by its linear pottery style, characterized by incised lines and white-on-red painted motifs on bowls and amphorae, which served practical purposes in processing wheat, , and introduced from Anatolian sources. Stockbreeding played a central role, with archaeological residues indicating the herding of , sheep, and , enabling pastoral mobility that supported settlement growth in marginal landscapes. Isotopic analysis from sites like Versend-Gilencsa confirms dairying practices by the early 6th millennium BC, underscoring the culture's adaptation of Southwest Asian to Balkan bioclimates. The , extending from its origins around 6200 BC into the 6th millennium across the central and western , exemplifies the consolidation of these farming dispersals with its impressed ware tradition. This , featuring shell, finger, or tool impressions on coarse, organic-tempered vessels, was produced at open-air settlements like Starčevo and Crkvina Rudine, reflecting communal production techniques and use in both domestic and ritual contexts. The culture's economy emphasized , with evidence of plowed fields and animal pens from sites in and , while its extension into the millennium highlights interactions with local foragers, fostering cultural hybridization. By mid-century, these communities had developed longhouses and figurines suggestive of . A notable innovation within the broader Vinča horizon, emerging around 5300 BC in the Danube Basin, was the appearance of —non-pictographic marks incised or painted on and figurines, often in repetitive sequences that some scholars interpret as precursors to systems. Found at sites like Vinča-Belo Brdo, these symbols, including geometric shapes and linear motifs, may have served administrative or ritual functions, predating Sumerian cuneiform by millennia and highlighting the ' early experimentation with symbolic communication.

Asian Developments

South and Southeast Asia

In the 6th millennium BC, the site in present-day continued to serve as a key early farming settlement, building on its foundations with advancements in and . Residents cultivated a range of crops including , , and notably (Gossypium arboreum), evidenced by mineralized fibers preserved within a bead from a context, marking the earliest known use of in the . This development suggests local experimentation with textile plants in the arid Kachi Plain, potentially under proto-domestication. Architectural features evolved to include multi-roomed structures built with mud-brick platforms and walls, often featuring hearths and storage facilities, which supported sedentary village life and resource management. The site in , , was occupied during the 6th millennium BC as part of the earlier (c. 7500–6000 BC), a precursor to the Indus Valley tradition, characterized by the distinctive Hakra ware pottery—handmade vessels with incised designs used for storage and cooking. Excavations reveal subterranean pit dwellings transitioning to above-ground mud-brick houses, alongside evidence of cattle herding and wild grain collection, indicating a adapted to the seasonal system. This culture laid foundational practices for later Harappan urbanism, with radiocarbon dates from charcoal samples confirming occupation from the late 7th into the 6th millennium BC. The strengthening of the during the mid-Holocene facilitated the spread of rain-fed farming economies across South and , enabling the cultivation of drought-resistant millets like broomcorn and foxtail in northwestern by around 5500 BC, while gathering intensified in the Gangetic plains. These adaptations to monsoon rhythms supported population growth in riverine villages, with evidence from sites like showing early management of species as precursors to . In , early management of is noted, with full domestication occurring later around the 4th–. Together, these innovations in the 6th millennium BC formed the bedrock for the Indus Valley's mature phase, blending , , and monsoon-dependent patterns.

East and North Asia

In , the 6th millennium BC marked the emergence of significant cultures along the and its tributaries, characterized by advancements in and adapted to the region's . The , initiated around 5000 BC, developed in the middle valley, where communities established sedentary villages supported by millet farming and the production of distinctive painted vessels featuring geometric and zoomorphic designs. This innovation, often fired in kilns and decorated with red pigments on a buff background, facilitated storage and cooking for millet-based diets, reflecting early in riverine settlements. Millet cultivation, primarily foxtail and broomcorn varieties, intensified during this period, providing a staple crop that underpinned and cultural continuity across hundreds of sites. Further north, in the northeastern regions of , the Zhaobaogou culture (c. 5400–4500 BC) exemplified early adaptations to cooler, transitional landscapes through millet domestication and semi-subterranean architecture. Located primarily in the Luan River valley of , these communities domesticated broomcorn and foxtail millets as early as the early 6th millennium BC, integrating them with and gathering in a . Pit houses, typically rectangular or oval with posthole foundations, served as primary dwellings, offering insulation against harsh winters and indicating planned village layouts with evidence of cultivation tools. These innovations highlight a gradual shift toward agricultural reliance in northern latitudes, distinct from the more intensive farming of southern river basins. In North Asia, the period saw the rise of fortified hunter-gatherer societies amid expansive steppes and taiga, underscoring nomadic mobility and defensive adaptations. The Amnya complex in western Siberia, dating to c. 6000 BC, represents the world's oldest known promontory fort, featuring double lines of wooden palisades, earthen ditches, and banks enclosing pit houses on elevated terrain near the Ob River. This fortification, constructed by elk-hunting groups, protected mass-harvested resources during seasonal migrations, demonstrating complex social structures and conflict resolution among mobile foragers without reliance on agriculture. Its significance lies in challenging assumptions of sedentary farming as a prerequisite for defensive architecture, instead linking fortifications to resource abundance and intergroup tensions in Siberian ecosystems. Additionally, back-migrations of Native American-related ancestry reached the around 5500 BC, as revealed by genomes from hunter-gatherers showing admixture with eastward-moving Siberian populations. This gene flow, detected in 7,500-year-old samples, underscores bidirectional exchanges across , enriching North Asian genetic landscapes during a time of climatic warming and resource shifts.

African Developments

North Africa

In the 6th millennium BC, was largely within the , characterized by a green with expansive lakes, savannas, and reliable rainfall that supported diverse human adaptations, including and foraging. The onset of Saharan aridification began around 5300 BC, marking the gradual transition to more desert-like conditions and influencing migrations by the mid-Holocene. This climatic shift led to the drying of lakes and wadis across the , prompting and groups to relocate toward more reliable water sources such as the Nile Valley. Archaeological evidence from radiocarbon-dated sites in the eastern , including Dakhleh Oasis and , shows a decline in occupation density after approximately 5300 BC, with populations incorporating Saharan cultural elements—like styles and —into early Nile Valley societies. The Fayum Neolithic in Egypt, spanning approximately 5450–4000 BC, exemplifies early adaptations to the regional environment through the establishment of semi-sedentary communities around the Fayum Oasis. Residents practiced barley (Hordeum vulgare) cultivation, supported by charred plant remains and radiocarbon dating from sites like Kom K and the Northern Shore, alongside hunting, gathering, and fishing in the ancient lake environment. Cattle herding emerged as a key subsistence strategy, with domesticated Bos taurus evidenced by abundant bones at these sites, reflecting a mixed economy that buffered against emerging aridity; this pastoral focus likely drew from Saharan traditions migrating eastward. Further west in the , the Upper (c. 6000–4000 BC) persisted as a tradition amid these environmental conditions, characterized by intensive exploitation of land snails and wild game. Sites such as Bir Hmairiya and SHM-1 in reveal shell middens with terrestrial gastropods comprising a major dietary component, complemented by faunal remains of gazelles, hartebeests, and smaller mammals, indicating seasonal aggregations at resource-rich locations. in the Jebel Ousselat region, including panels at Aïn Khanfous and R’mada depicting like rhinoceroses and early domestic rams, underscores a cultural emphasis on and nascent during this transitional phase. This period also saw maritime mobility, with evidence of migration from to Mediterranean islands around 5900 BC influencing early settlements on . of ancient soils and genetic analysis of remains from sites like those excavated since 1987 indicate that initial colonists arrived via open-sea voyages, carrying North African genetic signatures alongside European ones, and exploiting marine resources such as and before the arrival of farmers around 5000 BC. These movements highlight the adaptive seafaring capabilities of Saharan-edge populations.

Sub-Saharan Africa

In the 6th millennium BC, was characterized by diverse foraging economies and the initial experiments with , facilitated by the ongoing that transformed the Sahara-Sahel zone into expansive savannas with increased rainfall and vegetation. Populations, primarily hunter-gatherers supplemented by early , adapted to these lush environments through seasonal , exploiting wild resources while beginning to manage in semi-sedentary settlements. This era marked a transitional phase toward more intensive food production, though full agricultural domestication remained limited until later millennia. A prominent example of early pastoral innovation is the Nabta Playa site in southern Egypt's Western Desert, near the modern Sudan border, where communities established seasonal settlements around 6000–5000 BC. These inhabitants domesticated cattle, as evidenced by faunal remains and ritual burials of articulated bovine skeletons within stone structures, suggesting cattle held symbolic and economic importance. The site also features megalithic alignments, including stone circles and linear arrangements up to 2.5 kilometers long, interpreted as possible astronomical markers or ceremonial complexes that indicate emerging social complexity among these pastoralists. Such developments highlight Nabta Playa's role in the local origins of herding practices that influenced broader northeastern African prehistory. In West Africa, particularly in the Sahel regions of modern Mali and surrounding areas, communities gathered wild sorghum (Sorghum bicolor) and pearl millet (Pennisetum glaucum) as dietary staples, with archaeological evidence of their use dating to approximately 5000 BC. Phytoliths and charred remains from sites in northeast Mali confirm the exploitation of these grasses in foraging strategies, though genetic and morphological changes indicating full domestication did not occur until around 2500 BC. These wild cereals complemented protein sources from hunting and nascent herding, supporting population growth in the humid savannas. Rock art in the Sahara-Sahel transition zones, such as those in the and Jebel Uweinat regions, depicts herding scenes with cattle and occasionally small , tentatively dated to the early-to-mid 6th millennium BC. These engravings and paintings illustrate mobile life, including humans tending herds amid verdant landscapes, reflecting the cultural significance of in daily and contexts. The period's environmental shifts drove significant population movements, as the greening of savannas during the early 6th millennium BC attracted expansions from northern groups southward, only for drying trends that began toward the end of the around 3500-3000 BC to prompt migrations toward more stable riverine and coastal zones. This , evidenced by records and cores, led to the abandonment of interior sites like and intensified pressures on foraging-pastoral economies, fostering dispersal into sub-Saharan heartlands. These dynamics underscore the adaptability of Sub-Saharan populations in addressing African diversity beyond northern influences.

American Developments

North America

The Archaic period in , spanning roughly 8000 to 1000 BC, marked a shift toward diverse economies as post-glacial environments stabilized, with populations adapting to regional resources through intensified , gathering, and early experimentation with plant management. In the 6th millennium BC (6000–5000 BC), these adaptations varied widely across the continent, from coastal and riverine exploitation in the East to desert in the Southwest and salmon-focused strategies in the , reflecting in-situ cultural developments among descendant groups of Paleoindian migrants. Tools like the atlatl, a that extended throwing range and force, became widespread during this time, enabling more efficient and contributing to the period's technological consistency amid ecological diversity. In the , the climactic eruption of around 5700 BC profoundly altered landscapes and resources, blanketing areas up to 500 miles away with ash up to 4 feet thick near the volcano and thinner layers farther east, which disrupted vegetation, reduced animal populations, and likely forced human groups to relocate or adapt strategies temporarily. Archaeological evidence from sites in and shows a hiatus in occupation layers coinciding with the ash fall, suggesting impacts on local hunter-gatherers who relied on diverse and , though recovery occurred within centuries as ecosystems rebounded with nutrient-rich soils fostering new growth. This event underscores the vulnerability of populations to natural disasters in the region's volcanic terrain. Further south in the Southeast, precursors to later mound complexes like emerged during the Middle Archaic around 3500 BC, with early earthen constructions serving as platforms or communal features at sites such as in the Lower Mississippi Valley, indicating organized labor and ritual activities among foraging groups. These structures, built from basket-loads of soil, represent initial steps toward monumental architecture, contrasting with the nomadic patterns elsewhere and highlighting social complexity in resource-rich riverine environments where nuts, seeds, and fish dominated diets. Genetic studies point to back-migrations from to and Siberia's region, evidenced by shared Y-chromosome haplotypes between and indigenous Altaians, though primary focus remained on local developments like intensified shellfish gathering. In the Southwest, the Desert adaptation featured mobile bands exploiting arid landscapes with pinyon nuts, , and small game, while early experimentation with —introduced via diffusion from —began appearing in archaeological contexts by around 2100 BC, though precursors of practices trace back to Mesoamerican innovations circa 5500 BC. Sites in and yield cob fragments and pollen indicating tentative adoption, supplementing foraging rather than replacing it, and reflecting cultural exchanges along routes. Overall, the 6th millennium BC showcased remarkable regional diversity, from seed processing to hunting, fostering resilient societies that laid foundations for later innovations without widespread .

Mesoamerica

In , the 6th millennium BC saw the continuation of Archaic period adaptations with early experiments in and settlement. Sites in the Tehuacán Valley, such as Coxcatlan Cave, provide evidence of () cultivation dating back to around 5500 BC, alongside gathering of wild plants and hunting. These developments represent initial steps toward in a region that would later become central to , with small, semi-sedentary groups adapting to diverse environments from highlands to lowlands.

South America

In the Andean region during the 6th millennium BC, early human adaptations to coastal and highland environments included sophisticated mortuary practices among the in northern and southern . The Chinchorro people, sedentary fisher-hunter-gatherers along the arid , developed the world's oldest known artificial mummification around 5450 BC, predating practices by millennia. This involved deliberate removal of organs, defleshing, drying, and reconstruction of bodies using clay, reeds, and animal hides to create "" and "" mummies, reflecting complex social and ritual systems centered on ancestor veneration. Evidence from sites like and Morro 1 reveals cemeteries with over 300 mummies, indicating community investment in preserving the dead amid a harsh environment reliant on marine resources. Further north in the , a major volcanic event at Cueros de Purulla in present-day around 5870 BC produced a large buoyant ash cloud, depositing the Cerro Paranilla Ash across the Calchaquí Valleys and potentially disrupting local populations through ash fallout and altered climate conditions. This eruption, one of the significant events in the Central , coincided with period adaptations where groups managed resources in diverse ecosystems, from coastal exploitation to mobility. While direct archaeological impacts on settlements remain under study, the ash layers provide tephrochronological markers for correlating environmental changes with human responses in the southern Puna region. In the lowlands, early cultivation of staple crops marked a shift toward and semi-sedentary village life by the mid-6th millennium BC, building on processes initiated earlier. Archaeological evidence from southwestern ia, including sites in the Llanos de Moxos, shows ( spp.) cultivation dating back to approximately 8250 BC and manioc (Manihot esculenta) from around 8350 BC, with intensified use by 6000–5000 BC in raised-field systems and forest islands. These practices supported small villages focused on humid riverine environments, contrasting with the more mobile patterns in , such as mound-building, by emphasizing ritual complexity tied to fertile floodplains. and starch grain analyses confirm these crops' role in diverse , countering views of the as solely a domain during this era. Along the northern Caribbean coast of , the Puerto Hormiga site in represents one of the earliest instances of production in the , emerging around 4000 BC amid shell middens indicating intensive exploitation. This coastal , comprising multiple shell mound complexes, reflects the formation of stable villages by fisher-foragers who crafted fiber-tempered ceramics for cooking and storage, facilitating resource processing in and estuarine settings. The site's platform constructions by 4000 BC and associated middens of oysters and clams highlight adaptive strategies to tidal ecosystems, predating widespread and underscoring 's independent ceramic innovations.

Oceanian Developments

Australia

During the 6th millennium BC, indigenous peoples of —comprising the Australian mainland, , and —demonstrated sophisticated adaptations to post-glacial environmental changes, including rising sea levels that isolated from the mainland around 12,000 years ago, or approximately 10,000 BC, severing land connections and prompting distinct cultural trajectories on the island. This isolation, driven by meltwater pulses raising global sea levels by over 120 meters since the , led Tasmanian Aboriginal groups to refine resource strategies in a cooler, wetter landscape, emphasizing mobility across diverse terrains while maintaining oral traditions of the former . Across , emerged as a core landscape management practice, with archaeological evidence from sediment cores and charcoal layers indicating systematic low-intensity burns to promote grassland regrowth, enhance hunting grounds, and reduce wildfire risks, a technique traceable to at least 47,000 years ago but integral to 6th-millennium ecosystems. These burns shaped continental vegetation mosaics, fostering biodiversity hotspots for kangaroos and other prey, as evidenced by pollen records from sites like Lake George in showing increased grass dominance during this period. In , particularly , proliferated as a medium for , with paintings in the Maliwawa style dated between 9,400 and 6,000 years ago (7400–4000 BC) depicting hunts including thylacines (still present on the mainland until c. 3,000 years ago) and giant bilbies (extinct c. 40,000 years ago), preserving cultural memory of ancestral landscapes altered by climate shifts. These and figures, analyzed through on associated pigments, illustrate semi-sedentary lifestyles involving seasonal camps near rock shelters, where artists captured communal scenes to transmit knowledge of ancestral landscapes altered by climate shifts. Such not only reflected through fire management but also highlighted adaptive in a warming , with motifs emphasizing human-animal interconnections in a post-megafaunal world. Further south, the people of southwestern exemplified advanced through eel aquaculture at the Budj Bim Cultural Landscape, where stone weirs, channels, and ponds—constructed from ancient lava flows—harnessed short-finned eels (Anguilla australis) starting at least 6,600 years ago (4600 BC), enabling semi-sedentary villages housing hundreds. of organic sediments in these structures confirms their use for trapping, farming, and smoking eels for trade and sustenance, transforming wetlands into productive systems that supported population densities higher than typical norms. This engineering, spanning over 100 square kilometers, integrated with fire-stick practices to maintain wetland health, underscoring a holistic approach to Sahul's ecosystems during the mid-Holocene transition.

Pacific Islands

During the 6th millennium BC, human populations in the Pacific Islands, particularly in including the highlands of (which was connected to as part of until separation around 8,000 BC), intensified their adaptation to isolated island environments through early agricultural practices. Archaeological evidence from Kuk Swamp in the Upper Wahgi Valley indicates that (Colocasia esculenta) was utilized as early as 10,220–9,910 calibrated years (cal BP), corresponding to the early , with intensive cultivation of bananas ( spp.) emerging by 6,950–6,440 cal BP (approximately 4950–4400 BC). These developments suggest possible migrations or expansions into highland areas around 6000–5000 BC, where vegetative propagation of crops like and bananas supported semi-sedentary communities in montane rainforests. Stabilization of sea levels during the mid-Holocene, around 5000 BC, facilitated the establishment of more permanent coastal settlements across , as rising waters from post-glacial melt slowed and approached near-modern positions. This environmental shift allowed for expanded exploitation of and lowland vegetation, contrasting with the more terrestrial adaptations seen in continental . However, direct evidence remains limited, with many early sites inferred from and records rather than durable structures. The scarcity of major archaeological sites from this period stems from the use of perishable materials like wood and plant fibers in humid, tropical conditions, compounded by sea-level fluctuations that submerged or eroded coastal occupations. Insights into pre-Lapita societies—precursors to later Oceanic cultures—are thus primarily drawn from indirect proxies such as drainage features and plant remains at inland locales like Kuk Swamp, highlighting the challenges of preserving evidence in volcanic and dynamic island settings. Volcanic activity on islands like those in the posed risks through eruptions and ashfall, while frequent patterns disrupted by altering vegetation and coastlines, prompting adaptive strategies focused on resilient root crops and diverse marine gathering.

Cultural and Technological Advances

Agriculture and Domestication

The 6th millennium BC marked a pivotal phase in the transition, characterized by the consolidation and spread of across multiple independent centers of domestication worldwide. In the of the , emmer (Triticum dicoccum) and (Hordeum vulgare) had been initially domesticated around 8500–7500 BC but saw widespread cultivation and genetic fixation of traits like non-shattering rachises by circa 6000 BC, enabling reliable harvests. Similarly, in along the and River basins, common millet (Panicum miliaceum) and foxtail (Setaria italica) underwent processes starting around 8000 BC, with evidence of intensive cultivation by 5500 BC in northern China, supported by its drought resistance. In , early experiments with (Zea mays) from teosinte precursors are attested from sites like Guilá Naquitz Cave, dating to approximately 6250–5500 BC, indicating the beginnings of selective propagation for larger cobs, alongside initial of (Cucurbita spp.) around 7000–6000 BC. These developments occurred independently in at least five major hearths: the , the and Rivers, , the (with root crops like potatoes emerging later in the millennium), and highland (with and bananas). Animal complemented these plant-based systems, providing secondary resources like milk, wool, and traction. In the , sheep (Ovis aries) and goats (Capra hircus) were fully integrated into herding economies by 6000 BC, following initial domestication around 8500 BC, while cattle (Bos taurus) and pigs (Sus domesticus) showed evidence of managed breeding in the eastern regions during the 6th millennium BC. In , pigs were domesticated independently around 8000 BC and became central to by 5500 BC. In the , domestication was more limited, with dogs already widespread from earlier periods, though llamas (Lama glama) in the developed later around 4500 BC. Techniques advanced through , where humans favored plants and animals with desirable traits such as larger seeds or docility, leading to morphological changes over generations. Early irrigation practices emerged, including simple systems and fire-irrigation methods in the Yangtze Delta around 6000 BC to support paddy fields. Storage innovations, such as mud-brick granaries and plastered bins at sites like in (occupied until circa 5700 BC), allowed for surplus retention, with one structure yielding over 100 kg of charred grains. These agricultural advancements generated food surpluses that fueled and enabled specialization, as fewer individuals needed to focus on food production, allowing roles in crafting, , and ritual. This shift laid the groundwork for sedentary communities and emerging complexities in human societies.

Astronomy and Calendars

During the 6th millennium BC, early human societies in demonstrated rudimentary astronomical knowledge through monumental alignments, most notably at in southern . This site, occupied intermittently between approximately 10,000 and 4,500 years ago with peak activity around 7,000 to 5,000 years ago, features a about 4 meters in diameter containing six small stone slabs arranged in a pattern that aligns with the rising sun on the summer solstice. Additional megalithic structures at the site, including lines of stones and cattle burials oriented toward cardinal directions, suggest these were used by pastoralist communities to track seasonal changes critical for migration and water availability in the now-arid region, predating similar features at by millennia. Retrospective astrological interpretations place the 6th millennium BC within the , spanning roughly 6480 to 4320 BC, based on the precession of the equinoxes—a slow astronomical shift completing a full cycle every 25,920 years, causing the vernal equinox to move backward through the zodiac constellations at about 2,160 years per age. This era is associated in with advancements in , , and symbolic abstraction, such as the emergence of and polychrome ceramics in the around 6500 BC, potentially influencing later mythological motifs of duality and exchange found in Indo-European traditions. Later calendrical systems retrospectively anchored their epochs to events in the 6th millennium BC, reflecting theological computations of cosmic origins. The Byzantine Creation Era, formalized in the by the AD, sets the world's creation on , 5509 BC, using the Septuagint's chronology to mark from that date through August 31, 5508 BC, and was employed for civil and ecclesiastical purposes until the . Similarly, the 6th-century historian and bishop calculated creation approximately 5,597 years before the 397 AD death of , yielding a date around 5200 BC, aligning with other patristic chronologies like those of and Augustine that emphasized a mid-6th millennium BC origin. A significant anomaly around 5480 BC, evidenced by a rapid 20‰ increase in atmospheric radiocarbon (¹⁴C) levels over 8–14 years in tree rings from North American bristlecone pines, indicates unprecedented activity in the —far exceeding typical grand minima like the . This event, confirmed through across multiple laboratories, likely resulted from an extreme weakening of the , successive proton events, or their combination, potentially disrupting early seasonal observations tied to agricultural cycles.

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