ESS102H1 Lecture Notes - Feldspar, Pesticide, Clastic Rock

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22 Jan 2013
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Temp fluctuate 8 -10 degrees amplified when both poles have ice. Uncomforatbale periods for macroorgnisms glacial and inter glacial periods. Not suvive bc more succeptile to human climate change but numbers down bc of humans. Some atoms formed during stars exploding unstable and those unstable they will give off energy or particle and converted. Start with 100 percetn parent follows exponential curve daughter into goes up. Parent daughter ratio and know decay constant put date to something. Through dating radio decay and ustable isotopes dates put on figures. Two major ways of date things not always able to measure using geochronology. Not possible til instruments developed measure these things. Before 20th century and discovery of unstable isotopes radioactivey and mass spectromemter instrumebt measue at high enough precision. Used similar fossils in units to cross correlate layers over mass distances. Bony shells and well preserved before unicellular poor presentation and not much geo could do to differntaite or cross corealate.

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