GEOL-1021EL Lecture Notes - Lecture 9: Geologic Time Scale, Absolute Time And Space, Unconformity

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16 Jun 2018

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November 13, 2017

GEOL-1021

Geologic Time

Reconstructing Geologic Time Using the Stratigraphic Record

•Principles of stratigraphy

•Original horizontality

•Superposition

•faunal succesion

•Left undisturbed, youngest rocks will always be on the top of oldest rocks

•Unconformities: gaps in the record

•Disconformity (slide 15-17) (HARD TO SEE)

•angular unconformity (18-21) (EASY TO SEE)

•Cross-cutting relationships (dike is before, fault is last)

•Faults

•Intrusions

•Divisions of geologic time

•Supereon

•eons

•eras

•periods

•Epochs

•Measuring absolute time with radioactive clocks

•Isotopic dating theory

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