late Pleistocene
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| late Pleistocene | |
|---|---|
| Name | Late Pleistocene |
| Start | ~126,000 years ago |
| End | ~11,700 years ago |
| Preceded by | Eemian |
| Followed by | Holocene |
| Notable events | Last Glacial Maximum; extinction of many megafauna; dispersal of Homo sapiens |
late Pleistocene The late Pleistocene marks the terminal interval of the Pleistocene Epoch characterized by major climatic oscillations, biotic turnovers, and widespread human dispersals. This interval saw the Last Glacial Maximum and subsequent deglaciation that reshaped landscapes, drove megafaunal extinctions, and coincided with transformative cultural innovations among Homo sapiens, interactions with Denisovans and Neanderthals, and the peopling of the Americas, Australasia, and Eurasia. Geological, paleontological, and archaeological records from sites such as La Brea Tar Pits, Lascaux, Clovis culture localities, and Siberia preserve evidence for these processes.
Definition and Chronology
The interval conventionally spans from the end of the Eemian interglacial (~126,000 BP) to the onset of the Holocene (~11,700 BP), incorporating stadials and interstadials like the Last Glacial Maximum and the Younger Dryas. Chronostratigraphy relies on signals from Greenland ice cores (e.g., NGRIP), Antarctic ice cores (e.g., EPICA), and marine isotope stages (notably Marine isotope stage 2). Radiometric frameworks employ radiocarbon dating calibrated with IntCal curves, supplemented by uranium–thorium dating, optically stimulated luminescence (OSL), and tephrochronology from volcanic centers such as Toba and Campi Flegrei.
Climate and Environmental Changes
Late Pleistocene climates were dominated by glacial–interglacial variability regulated by Milankovitch cycles identified by Milutin Milanković and modulated by feedbacks involving ice sheets (Laurentide, Fennoscandian), atmospheric greenhouse gases recorded at Vostok and Mauna Loa, and ocean circulation changes including shifts in the Atlantic Meridional Overturning Circulation. The Last Glacial Maximum (~26,500–19,000 BP) produced expanded ice margins documented across Greenland, Fennoscandia, Patagonia, and Canada, lowering global sea level and altering precipitation patterns reflected in Lake Baikal and Dead Sea records. Abrupt events such as the Younger Dryas cold reversal and rapid warming episodes are recorded in Cariaco Basin sediments and Gulf Stream reorganization reconstructions.
Faunal and Floral Changes and Extinctions
Late Pleistocene ecosystems experienced substantial turnover: megafauna such as Woolly Mammoth, Saber-toothed Cat taxa including Smilodon fatalis, Glyptodon, Giant Ground Sloth genera (e.g., Megatherium), and Pleistocene equids vanished across multiple continents. Causes debated include anthropogenic impacts linked to hunting by Clovis culture peoples, climatic habitat loss during deglaciation, and pathogen hypotheses discussed in literature concerning interactions with Neanderthals and Homo sapiens. Vegetation shifts from mammoth steppe to modern biomes are preserved in pollen sequences from Greenland, Siberia, Beringia, and Europe, while refugia dynamics in regions such as the Iberian Peninsula, Caucasus, and Balkans influenced postglacial recolonization and phylogeographic patterns in taxa including European beech and brown bear.
Human Populations and Cultural Developments
The late Pleistocene is pivotal for hominin evolution and cultural complexity. Anatomically modern Homo sapiens dispersed out of Africa into Levantine corridors and across Eurasia, interacting and interbreeding with Neanderthals at sites like Vindija Cave and with Denisovans in Denisova Cave. Technocomplexes include the Upper Paleolithic industries such as the Aurignacian, Gravettian, Solutrean, and later regional phenomena like the Magdalenian; in North America, the Clovis culture marks distinctive fluted point technology. Artistic and symbolic expressions are exemplified by cave parietal art at Lascaux and portable art from Venus of Willendorf, while subsistence intensification and broad-spectrum foraging are recorded at Ohalo II, Dolní Věstonice, and Monte Verde.
Geomorphology and Sea-Level Changes
Deglaciation produced major geomorphic reworking: glacial retreat sculpted fjords in Norway, drumlin fields in Ireland, and moraine systems across Canada. Meltwater pulses such as Meltwater Pulse 1A contributed to rapid global sea-level rise, inundating continental shelves including the Sunda Shelf and Bering Land Bridge (Beringia), reshaping migration pathways and coastal ecosystems. Isostatic rebound is evident in regions like Scandinavia and Hudson Bay, altering relative sea level and river drainage captured in sedimentary records from Murray-Darling Basin and Mississippi River terraces.
Regional Expressions and Biogeography
Biogeographic patterns varied regionally: in Siberia and Beringia a cold-adapted mammoth steppe persisted, supplying corridors for faunal and human movement into the Americas; in Europe glacial refugia in the Iberian Peninsula, Italy, and Greece preserved temperate taxa; in Australia late Pleistocene aridification coincided with megafaunal decline and Aboriginal colonization evidenced at Lake Mungo and Nandalur. Tropical regions such as Amazonia experienced forest fragmentation and savanna expansion, affecting endemic faunas and preceramic human groups. Island scenarios—e.g., Madagascar and New Zealand—reflect delayed human arrival and rapid anthropogenic modification during the terminal Pleistocene and early Holocene.