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12 Cards in this Set
- Front
- Back
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Recent Glaciaction, when did it start? How many major epochs?
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1 milion years ago. 4 major advances (epochs)
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Where were the biotic refuges?
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In the Ozarks, Appalacians, Coastal Plain, Mississippi Valley
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Tills
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Unsorted deposits (sand, clay, pebble, boulders) that were plastered down on the earth's surface.
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Outwash
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material that is deposited and then reworked by water (sorted) via differential stream energy into deposits of silt and/or gravel.
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Clays
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deposited in former lake basins (depressions)
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Moraines
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deposits of debris from a glacier, indicates the glacier sat in place for a while and piled up debris like a conveyer belt.
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Pitted ground moraines and pitted outwash plain
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pitted ice blocks that melt out and form depressions
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Proglacial Lakes
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form when meltwater cannot escape rapidly and backs up behind a morainal dam and the glacier itself
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Eskers
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gravely, formed from streams under the glaciers
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Drumlins
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teardrop shaped till deposits
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Loess
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wind blown sediment from glacial deposits
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What are the climatic factors on pre-settlement vegetation?
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Tension zone- southern limit of northern species and northern limit of southern species, based on range maps of herbarium specimens
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