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Correlation Using Relative Ages

A distinctive rock unit or index fossil can be correlated across a distance and help to piece together a geologic history for the region.

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Leaf Fossils in Lapilli Tuff
A sample of volcanic ash is used to demonstrate leaf fossils in lapilli tuff. Learn how the distinctive texture of the volcanic rock and the included fossils can be used to help correlate it with other volcanic rocks in the region.

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