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PPT02 - Geological Time

PPT02 - Geological Time - P-Paleozoic M-Mesozoic C-Cenozoic...

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P----------------Paleozoic M-------------------Mesozoic C---------------------Cenozoic Come ------------------Cambrian Over---------------------Ordovician Some-------------------Silurian Day----------------------Devonian Come-------------------Carboniferous Play----------------------Permian This----------------------Triassic Jerk----------------------Jurassic Cheats------------------Cretaceous Then---------------------Tertiary Quits---------------------Quaternary GEOLOGICAL TIME James Usher (1581 - 1665) Archbishop of Armagh • Adds up all dates in Bible • Earth 6000 years old • Created on October 22, 4004BC George Louis De Buffon (1707 - 1788) • Heated spheres • Calculated time to cool • Earth 75 000 years old TIMING THE EARTH Relative and “ absolute ” dating RELATIVE DATING • Developed from understanding basic laws of stratigraphy - Steno(1669) Stratigraphy : the way in which rocks (mostly sedimentary) are laid down 1. The principle of original horizontality • A generalization: rocks that are now tilted were once deposited in horizontal layers 2. The Principle of superposition • “what’s on top is youngest” • Can now view vertical set of strata as a STRATIGRAPHIC SEQUENCE
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