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Lecture 15

GLY 1842 Lecture 15: oct. 3

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GLY 1842
Andrew Heckert

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Oct. 3 dinosaurs of american west brief history - ongoing science to refine timescale (21st c) - numerical timescale 1950 - now - relative timescale erected 1800s - false starts 1700 - 1850 - birth of scientific methods - steno - 1600s - earth origin mythologies chronology - relative chronology 1 sequence of events 2 eg. seniors are older than juniors 3 based on stratigraphy 4 timescale has “names” eg. jurassic 5 this was the original basis for the geologic timescale - absolute chronology (done by adding numbers so called ) - numerical chronology 1 numbers 2 eg. 65 million years ago 3 based on radioisotopic dating (eg. carbon dating is a type of this) 4 timescale w numbers eg. 65 Ma 5 added to, does not replace, relative timescale 6 never do carbon dating with d
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