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Lecture 15

GLY 1842 Lecture 15: oct. 3
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Department
Geology
Course Code
GLY-1842
Professor
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
1sequence of events
2eg. seniors are older than juniors
3based on stratigraphy
4timescale has “names” eg. jurassic
5this was the original basis for the geologic timescale
-absolute chronology (done by adding numbers so called )
-numerical chronology
1numbers
2eg. 65 million years ago
3based on radioisotopic dating (eg. carbon dating is a type of
this)
4timescale w numbers eg. 65 Ma
5added to, does not replace, relative timescale
6never do carbon dating with dinosaurs
steno’s principles
-superposition
oldest on bottom youngest on top
-original horizontality
sed. rocks in horizontal layers
-lateral continuity
layers fill basin
-principle of cross cutting relationships
that which cutes is younger than what it cuts
-principle of inclusions
- inclusions are older than the including rock
-principles of faunal succession *******
1fossils of identical form are the same age
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Description
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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