iceLect - The Ice Ages NSA Howard Falcon-Lang Talk outline...

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The Ice Ages NSA © Howard Falcon-Lang
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Talk outline Part 1: How was the Ice Age first discovered? Investigation: Beetles as evidence of past climate Part 2: What causes Ice Ages? Investigation: The Day After Tomorrow? Part 3: What was Europe like in the Last Ice Age?
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Discovery (1): The Flood www.scottishgeology.com/gallery/image02.html Early geologists noticed a layer of sticky clay with boulders over much of Europe. Had it been deposited by a catastrophic flood like Noah’s Flood in the Bible? www.eriding.net/media/photos/geograp/_geo_lpp_007_boulder_clay.jpg boulder
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Discovery (2): The Alps en.wikipedia.org/wiki/Image:Johann_von_Charpentier.jpg In the early 1800s Jean de Charpentier observed the advance and retreat of glaciers in the Alps and studied the kind of deposits they left behind. 1820s 1850s Glacial retreat
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Discovery (3): Scotland In 1840, Louis Agassiz observed similar glacial features in Scotland. He found scratches on a rocky hillside near Edinburgh like those made by glaciers. He argued that Scotland had recently been covered in a thick ice sheet . en.wikipedia.org/wiki/Image:Louis_Agassiz-2.jpg
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Discovery (4): Ice Age landforms www.geo.umn.edu/courses/4703/Spring00/5-NorthShore/images/striations.jpg Agassiz amassed more evidence from landforms and boulder clays to support his idea of a Great Ice Age in recent times. Glen Roy, Scotland www.swisseduc.ch/glaciers/earth_icy_planet/glaciers15-en.html?id=15 Parallel marks show former level of an ice-dammed lake
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Discovery (5): Fossils www.colby.edu/geology/gifs/M.nelsoni.jpg www.aip.org/history/climate/images/Dryas_octopetala.pollengrain.jpg en.wikipedia.org/wiki/Image:Mammoth_mg_2791.jpg Pollen Mammoth Beetles Fossil discoveries also suggested that climate had recently been much colder . Beetles and pollen grains found in sediments associated with the boulder clays were identified as types known only from the Arctic tundra today. Woolly mammoths found deep frozen in Siberia had fur adapted to tundra life.
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Discovery (6): Chemical studies In the 1960s, chemical studies offered more evidence for an Ice Age.
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iceLect - The Ice Ages NSA Howard Falcon-Lang Talk outline...

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