Correlation of Rock Layers

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A fossil is not likely to be found in

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

Which rock type most often contains fossils?

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

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

Living corals are found in warm, shallow seas. Coral fossils have been found in the sedimentary rocks of Alaska. These findings suggest that

Which bedrock would be most likely to contain fossils?

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