Geologic Time Flashcards

1
Q

processes observed today were the same in the past

A

Uniformitarianism

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2
Q

Sedimentary rocks laid out in horizontal pattern and gravity causes it to even out; does not accumulate on a slop ; tilted rocks mustve been deformed

A

Principle of original horizontality

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3
Q

Rocks in an undeformed horizontal sequence

oldest on the bottom and youngest on top

A

principle of superstition

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4
Q

Younger features cut across older features

A

Principle of cross cutting relationship

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5
Q

rock fragment within another; xenoliths older rock (foreign rock)

A

principle of inclusions

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6
Q

3 unconformities

A

angular, disconformity, and nonconformity

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7
Q

at an angle, gap between the angle and horizontal shows huge gap of time

A

Angular unconformity

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8
Q

igneous/metamorphic rock capped by sedimentary rocks

rocks forming inside mountains

A

nonconformity

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9
Q

Parallel that are bounded by either side

stops depositing sediment changes in sea level caused

A

disconformity

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10
Q

used bible to figure how old earth was

A

Archbishop james usher

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11
Q

Scottish physician and farmer that used principle of uniformitarianism

A

James Hutton

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