GEOL 1003 Lecture Notes - Sea Level Rise, Glacial Motion, Radiocarbon Dating
Document Summary
11,000 years & most recent: humans evolve, large migration population. It"s important because explains how earth got to present state. Reveals the high rate of change that things are changed at (climate). Glacial retreat (15 ka) which allows for great lakes to form. 2 abrupt changes: vegetation (climate) & sea level rise. Very rapid sea level rise as glacier melting. Vegetation shifts as ice retreats (tundra and forests shift positions). Evaluate rate of change/elevation change by organisms such as coral. Younger dryas (glacial age): near full glacial conditions. Climate abrupt warmed around 15000 years ago then goes to gradually cooling then abrupt cooling then abrupt heating (global warming) between 3 years. 2 hypothesis: change ocean currents (circulation patterns), meteorite impact darkening sky & cooling planet. First americans (clovis) 13000 years ago (across bering strait). Extinction (12. 9 ka), start of yd kills a bunch of large mammals including first americans.
