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

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Aug 29, 2023 113 likes •277 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

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Dr. Andrew L. Kozlowski
Dr. Robert S. Feranec

Ice Ages

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Pleistocene – A very recent time in Earths history associated with abrupt climatic shifts and glaciation of mid-latitude continents “ the Ice Age”. Precambrian Era Paleozoic Era Mesozoic Era Cenozoic Era Abbreviated Geologic time Q Quaternary Period Holocene Epoch 11,600 Yr Bp - Present Pleistocene Epoch 1.8 my-11,600 Yr Bp

66 million years Bp 245 million years Bp 570 million years Bp

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Ice Sheets at Last Glacial Maximum

https://xkcd.com/1225/ From: Dyke (2002)

THICKNESS OF THE ICE SHEETS

AT VARIOUS LOCATIONS

25,000 YEARS AGO

COMPARED WITH MODERN SKYLINES 2100M 900M 1250M 3300M

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Glaciation of New York

Former glacial margin in central New York

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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

Ice Ages

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@14,000 years ago @8,500 years ago Present day

North American Biomes through Time

>17,000 years ago @15,500 years ago @14,000 years ago @10,000 years ago >17,000 years ago

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Jefferson’s Ground Sloth Megalonyx jeffersonii Stag Moose (Cervalces scotti) Caribou (Rangifer tarandus) Flat-headed peccary (Platygonus compressus) Giant Beaver (Castoroides ohioensis)

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Radiocarbon Dating:

The Cohoes Mastodon died some time between 12800 – 13100 years before present.

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Scientific Publications Online Education

Educational Products

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Resource(s) for Teachers/Students

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Societal Outreach