Friday, June 20, 2014

Strophodonta demissa from Penn Dixie

A few specimens of Strophodonta demissa from the Windom Shale (Bay View Coral Bed) as found at the Penn Dixie Site near Blasdell, NY. These are smaller than the specimen I found along Lake Erie and those from Sylvania, OH, but are about the size of those I've found at Arkona.

Specimen #1 (wet because I'd just washed off some light mud)

Specimen #2 (this one is completely dry)

The Windom shale is part of the Moscow Formation which is middle Deovnian (Givetian stage) in age.

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