Pictures of absolute dating how to double your dating pdf

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Pictures of absolute dating

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Ask yourself how the things that are happening in the world today might end up being recorded in the sediments that are now or soon will be deposited.

The key to identifying each specific type of unconformity is recognizing what the unconformity is on top of.

A major unconformity would mark the change from the building up of mountains to the wearing down of those same mountains and the subsequent blanketing of the area with sediments.

There are several specific types of unconformities.

The angular unconformity is the contact between the younger layers of sediment and the older, tilted strata beneath.

A nonconformity is an unconformity with sedimentary or volcanic strata on top and, beneath it, either plutonic rock such as granite or metamorphic rock such as schist.

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The possibilities for what is in the rocks immediately beneath the unconformity are (1) layers of sedimentary or volcanic rock (strata) that have been tilted or folded prior to development of the unconformity; (2) a stratum is parallel to the unconformity and parallel to the stratum above the unconformity; or (3) plutonic or metamorphic rocks, which originated much deep in the earth's crust rather than at its surface.

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