题目内容
An unconformity is a break in the rock record during which deposition ceased, erosion removed previously formed rocks, and then deposition resumed.
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Most layers of sediment are deposited in a horizontal position.
The Mesozoic era is the age of "middle life" on Earth
When magma works its way into a rock and crystallizes, we can assume that the intrusion is younger than the rock that has been intruded.
Which eon can be divided into Cenozoic, Mesozoic and Paleozoic?
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