Bio 201 S10 Lect 2 (True) v2r

Gcarbonforfossils50000years old

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Unformatted text preview: ow do we date fossil evidence? •  •  Rela9ve: fossils occur in sedimentary rocks –  Older rocks occur below younger rocks Geologic forma9ons of various ages are recognized, and o^en named, by the fossils they contain –  Can use this to match geologic layers from different parts of the world Absolute: –  Radioisotope da9ng •  E.g. carbon for fossils < 50,000 years old •  14C/12C ra9o in all living organisms is roughly constant –  But when organisms die, they stop gebng 14C from the environment and 14C/12...
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This note was uploaded on 02/18/2010 for the course BIO 201 taught by Professor True during the Spring '08 term at SUNY Stony Brook.

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