Megastrophia from the Windom Shale

Megastrophia are very large shells and when one gets an intact specimen you are lucky. I had some luck on my side when I uncovered the Megastrophia below at the Penn Dixie site near Blasdell, New York. I took extra care to excavate the rock around it so that it wouldn't break apart as I extracted it. As it is I soaked it in a thin solution of Elmer's glue and water to help strengthen the fossil.

Pedicle valve

Posterior

I'm not sure if both valves are present with this fossil as it is so delicate I don't want to work on it. It was collected from the Windom Shale member of the Moscow formation which is middle Devonian (Givetian) in age.