GEOL 1340 Lecture 34: GEOL Lecture 34
28 Nov 2016
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Document Summary
Retreat of glaciers after last ice age resulted in crustal rebound around hudson and n baltic. Meltwater carried lots of sed from ice sheets to outwash plains. During fall and winter melting ceased: glacial loess. 18000 during ice age, level 100 m lower than today: sea level and ice ages. Water removed from oceans sea level decrease. Sea level rise when ice age ends. Lacustrine deposit: lake sediment that form terraces along shorelines. Salt flats: paleoclimatology, deep sea cores. T change over layer 2 m. y. obtained thru proxy recorders. Deep sea sediment record more complete than glacial deposits. Foraminifera shells in sea can by analyzed for o isotopes to det seawater t at time shells formed. Protactinium 231 thorium 230 date clays back 300000 years: support for t change. Ice core records of gases and o isotopes from greenland similar to antarctica. Age dating of glacial deposits on land match ice core recs.
