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SlideshowReport

Original Horizontality

Description
Historical Notes

Catastrophism
Landscape developed by catastrophes
James Ussher, mid-1600s, concluded Earth was only a few thousand years old
Modern geology
Uniformitarianism
Fundamental principle of geology
“The present is the key to the past”

Modern geology
James Hutton
Theory of the Earth
Published in the late 1700s

Placing rocks and events in sequence
Principles and rules of
Law of superposition – oldest rocks are on the bottom
Principle of original horizontality – sediment is deposited horizontally
Principle of cross-cutting relationships – younger feature cuts through an older feature

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