Upper Pleistocene

Contents

Upper Pleistocene The Upper Pleistocene is the latest interval of the Pleistocene Epoch, spanning the late Quaternary and terminating at the beginning of the Holocene. It encompasses major climatic shifts, glacial maxima and deglaciation events that shaped the modern distribution of species, landscapes, and human cultures. Researchers in International Commission on Stratigraphy, Royal Society, National Oceanic and Atmospheric Administration, United States Geological Survey, and institutions such as the Smithsonian Institution and the Max Planck Society have integrated chronologies from radiometric, paleomagnetic, and stratigraphic studies to refine its limits.

Definition and Chronostratigraphy

The chronostratigraphic framework for the Upper Pleistocene relies on stratotypes, isotopic stages, and event markers recognized by organizations like the International Commission on Stratigraphy and laboratories at the Scripps Institution of Oceanography and Lamont–Doherty Earth Observatory. Key markers include the end of Marine Isotope Stage 6 and the sequence of Marine Isotope Stages 5–2 correlated with records from the Vostok Station, Greenland Ice Core Project, and cores from the North Atlantic Drift and Bering Sea. Age control is provided by ^14C dating developed at the University of Arizona, luminescence techniques refined at the University of Oxford, and uranium-series work at the University of Bern; these tie to stratotypes such as the Last Glacial Maximum and the transition to the Younger Dryas. The interval is subdivided into regional stages used in the European Commission for the Geological Map of the World and regional stratigraphic schemes adopted by the Geological Society of America and the Geological Survey of Canada.

The Upper Pleistocene records rapid shifts between stadials and interstadials documented in proxies from the Greenland Ice Sheet Project, the Antarctic EPICA cores, and marine cores analyzed by teams at the National Oceanography Centre. Notable climate events include the Last Glacial Maximum, the Bølling-Allerød warming, and the Younger Dryas. Teleconnections between the North Atlantic Oscillation, changes in the Atlantic Meridional Overturning Circulation, and shifts in the Sahara Desert monsoon system are inferred from pollen, dust, and isotopic records collected by the British Antarctic Survey, the Institute of Arctic and Alpine Research, and the PAGES (Past Global Changes) community. Volcanic forcing from events documented at Toba Volcano, Mount Etna, and Hekla has been correlated with short-term cooling episodes evident in the chronologies developed at the US Geological Survey and the Geological Survey of Japan.

Megafaunal turnovers during the Upper Pleistocene involved taxa associated with sites investigated by the Natural History Museum, London, the American Museum of Natural History, and the Institute of Vertebrate Paleontology and Paleoanthropology. Extinctions and range shifts affected species such as the woolly mammoth (evidence in collections at the Royal Ontario Museum), the woolly rhinoceros, and Pleistocene megafauna documented at La Brea Tar Pits, Willandra Lakes Region, and Old Crow Flats. Vegetation changes tracked by palynological studies from the Royal Botanic Gardens, Kew, the Botanical Institute of the Russian Academy of Sciences, and the University of Copenhagen show shifts from steppe-tundra to boreal forest in regions influenced by retreating ice sheets from the Fennoscandian Ice Sheet and the Laurentide Ice Sheet. Faunal migrations along corridors such as the Bering Land Bridge and into refugia like the Iberian Peninsula and Caucasus are documented in faunal assemblages curated by the Natural History Museum of Denmark and the Museo Nacional de Ciencias Naturales.

Upper Pleistocene archaeology records critical behavioral and demographic developments among hominins documented at sites excavated by teams from the Max Planck Institute for Evolutionary Anthropology, the University of Cambridge, and Harvard University. Anatomically modern humans dispersing from Africa interacted with Neanderthals at sites such as Denisova Cave, Châtelperronian assemblages, and Grotte du Renne contexts described in publications associated with the French National Centre for Scientific Research and the Institut Max von Pettenkofer. Cultural complexes including the Aurignacian, Gravettian, and Magdalenian industries produced art and technology seen in the Lascaux Cave, the Altamira Cave, and the Blombos Cave, with genetic data from the 1000 Genomes Project and labs at the Wellcome Sanger Institute illuminating population dynamics and admixture events with archaic humans inferred from DNA recovered by teams at the Karolinska Institute and the University of Copenhagen.

Regional stratigraphic records are preserved in glacial tills, loess-paleosol sequences, and marine terraces documented by the United States Geological Survey, the British Geological Survey, and the Geological Survey of India. European loess sequences from the Loess Plateau and the Danube Basin and North American deposits in the Great Plains and Yukon provide terrestrial archives correlated with marine records from the North Sea and the Mediterranean Sea. Periglacial landforms such as patterned ground and thermokarst documented in the Siberian Arctic and the Canadian Arctic Archipelago preserve evidence of permafrost dynamics studied by teams at the Norwegian Polar Institute and the Alfred Wegener Institute.

Multi-proxy reconstructions integrate data from ice cores recovered by the Greenland Ice Core Project and the European Project for Ice Coring in Antarctica, marine cores from cruises of the RRS James Cook and the RV Polarstern, speleothems from caves investigated by the University of Innsbruck, and pollen sequences analyzed by the Swedish Museum of Natural History. Isotope stratigraphy, sedimentology, and ancient DNA synthesized by consortia such as PAGES (Past Global Changes) and research groups at the Max Planck Society reconstruct vegetation, megafaunal presence, and human-landscape interactions during deglaciation phases culminating in the onset of the Holocene. These reconstructions inform models developed at the Met Office Hadley Centre, the National Center for Atmospheric Research, and the European Centre for Medium-Range Weather Forecasts that simulate Upper Pleistocene climates and test hypotheses about extinction, migration, and cultural change.