Relative age dating and cross cutting relationships

No bones about it, fossils are important age markers.

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The photograph below was captured at Volcano National Park on the Big Island of Hawaii.

Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.

Pretty obvious that the dike came after the rocks it cuts through, right?

After all, a dinosaur wouldn’t be caught dead next to a trilobite.

The narrower a range of time that an animal lived, the better it is as an index of a specific time.

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