Wednesday, August 28, 2013

Emanuella praeumbona from the Centerfield

I found this brachiopod fossil in the Centerfield formation of New York. It looks superficially like an Ambocoelia umbonata except that the brachial valve is more convex and the sulcus is much less pronounced. Also the overall shape of the shell is slightly "fatter" than Ambocoelia. It is for these reasons that I am labeling it Emanuella praeumbona.

Brachial valve
Pedicle valve

The Centerfield member is a part of the Ludlowville formation and is middle Devonian (Givetian stage) in age. Compare this to Ambocoelia umbonata fossils that I've found in the Hungry Hollow member of the Widder Formation (Ontario, Canada) and the Needmore Shale (Pennsylvania)

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