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5 Cards in this Set
- Front
- Back
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The idea that younger beds are deposited on top of older beds is called: |
Principle of Superposition |
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The combination of two or more groups is knows as what lithostratigraphic unit: |
supergroups |
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In relative geologic time, what are sedimentary rocks emplaced upon another set of sedimentary rock after a period of erosion called? |
Disconformity |
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What is the age of the meteorite impact at the Permian-Triassic boundary? |
255 Ma |
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What significant event occurred in the geologic time scale at the K-T boundary, 65 million years ago? |
mass extinction |
