Ice Ages Dr. Andrew L. Kozlowski Dr. Robert S. Feranec Pleistocene - PowerPoint PPT Presentation

Aug 29, 2023 •113 likes •273 views

Ice Ages Dr. Andrew L. Kozlowski Dr. Robert S. Feranec Pleistocene A very recent time in Earths history associated with abrupt climatic shifts and glaciation of mid- latitude continents the Ice Age. Abbreviated Geologic time Holocene

Ice Ages Dr. Andrew L. Kozlowski Dr. Robert S. Feranec
Pleistocene – A very recent time in Earths history associated with abrupt climatic shifts and glaciation of mid- latitude continents “ the Ice Age”. Abbreviated Geologic time Holocene Epoch 11,600 Yr Bp - Present Quaternary Q Period Pleistocene Epoch 1.8 my-11,600 Yr Bp Cenozoic Era 66 million years Bp Mesozoic Era 245 million years Bp Paleozoic Era 570 million years Bp Precambrian Era
Ice Sheets at Last Glacial Maximum From: Dyke (2002) THICKNESS OF THE ICE SHEETS AT VARIOUS LOCATIONS 25,000 YEARS AGO COMPARED WITH MODERN SKYLINES 3300M 2100M 1250M 900M https://xkcd.com/1225/
Glaciation of New York Former glacial margin in central New York
Ice Ages Radiocarbon ages >50,000 yrs OSL Ages 47,000 yrs 52,000 yrs Peat = Interglacial or warm interval ~50,000 years ago Overlying till deposit indicates return to glaciation
North American Biomes through Time >17,000 years ago @14,000 years ago @8,500 years ago Present day >17,000 years ago @15,500 years ago @14,000 years ago @10,000 years ago
Jefferson’s Ground Sloth Stag Moose Megalonyx jeffersonii ( Cervalces scotti ) Caribou ( Rangifer tarandus ) Giant Beaver Flat-headed peccary ( Castoroides ohioensis ) ( Platygonus compressus )
Radiocarbon Dating: The Cohoes Mastodon died some time between 12800 – 13100 years before present.
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