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12 Cards in this Set

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