outline18 - Outline18 4/3/03

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  Outline 18 4/3/03   Pleistocene  - 1.6 mill. yrs. ago - 12, 000 yrs. ago - very recent       C14 dating useful back to 50-60,000 yrs.      Major glaciation  is biggest physical event in Pleistocene.      Buildup of major ice caps  on land areas at high latitudes (down to ~ 45°           N + S) + sea ice  in Arctic + Antarctic Oceans + mountain glaciers  at           high elevations even into Tropics.  Ice caps built up to 3,000+ m             thick, depressed underlying continents (isostatic adjustments   +  ),            ice flowed outward from centers (most accumulation) to edges            (most melting) - plastic flow from high to low elevation.      Four major glacial advances  (named for midwest states here in U.S.;           most recent advance was Wisconsin Glaciation ) separated by melt-
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outline18 - Outline18 4/3/03

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