Correlation of Rock Layers

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Which bedrock feature is most useful in correlating sedimentary bedrock in one area with sedimentary bedrock in another area?

Which bedrock would be most likely to contain fossils?

In order for an organism to be used as an index fossil, the organism must have been geographically widespread and must have

Layers of volcanic ash often serve as useful geologic time markers because ash layers usually

Which processes most often cause fossil evidence to be preserved in rock?

Which kind of bedrock would most likely contain fossils?

A fossil is not likely to be found in

Which rock type most often contains fossils?