April Microphoto of the Month
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.