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Written by: Jim Beard
Wednesday April 23, 2014

Sedimentary Layers

This is a photomicrograph of a 7mm thick section of finely layered sedimentary rock. This rock was originally deposited 225 million years ago as layers of mud and silt in a shallow lake. Layers can form as a result of annual wet-dry cycles (very likely the case here) or from storm deposits or other disturbances. This particular sedimentary rock is from Pittsylvania County, Virginia and is famous for the well-preserved insect fossils found in it.

Sedimentary Layers

Tags: Dr. Jim Beard, Earth Science, Geology, Microphoto of the Month, Research and Collections

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