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14 Cards in this Set
- Front
- Back
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What is the principle that says "the present is the key to the past"?
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Principle of uniformitarianism
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What is the principle that says older layers on bottom, younger layers on top?
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Principle of superposition
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What is the principle that says, due to gravity, things will settle flat
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Principle of original horizontality
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What is the principle that says, if a canyon cuts a sheet of sediment, we can assume the shee was eroded away
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Principle of original continuity
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a period of nondeposition and possibly erosion
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unconformity
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an unconformity at which sedimentary rocks overlie
intrusive igneous rocks and/or metamorphic rocks |
nonconformity
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Imagine that a sequence of sedimentary beds has been deposited beneath a shallow sea. Then sea level drops, and the recently deposited beds are exposed for some time. During this time, no new sediment accumulates, and some of the preexisting sediment gets eroded away...
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disconformity
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The boundary surface between two formations
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geologic contact
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Geologic time breakdown
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eon, era, period, epoch
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Epochs end in?
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ene
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Periods end in?
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ous, ian, ic, ary
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Eons and Era end in?
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zoic
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Zoic means?
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life
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What drive plate motion?
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Ridge-push force and slab-pull force
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