GEOG 2OC3 Lecture Notes - Lecture 4: Glacial Landform, Canadian Shield, Australopithecus
19 Oct 2020
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Document Summary
The pleistocene is a recent glacial episodes that began roughly 2. 5 million years ago, marking the beginning of the quaternary period. Humanoid species (such as australopithecus and other homo sapiens) and finally. Homo sapiens (us) began to evolve into anatomically modern forms during the. It also marked the most recent glacial episode in the northern hemisphere, with ice sheets covering to roughly 30 degrees in latitude (around new york in the u. s. ) This mollde wide projection shows the earth during the pleistocene. Global plate distribution has pretty much stabilized and glaciers have advanced to around 40 degrees n. Ice sheets roughly 3 km thick covered parts of canada and europe. Earth orbits the sun in an ellipse. There are certain departures from this general shape due to the gravitational pull of the sun and moon on the earth"s equator: orbital eccentricity, axial precession, axial tilt.
