Sunday, July 19, 2015

Howella cycloptera brachiopod from the Kalkberg formation of New York.

I found several specimens of Howella cycloptera from the Kalkberg formation of New York for my collection. The shell has a flat hinge line with a semicircular shape along the margin. Both valves are inflated with the pedicle valve equal to or deeper than the brachial valve. A simple ridge and sulcus is present on the brachial and pedicle valve respectively. There are about seven round plications on either side of the ridge/sulcus on the surface of both valves with some some fine concentric growth lines present as well. Were there to be more plications then this could be Concinnispirifer concinnus but none of the specimens I collected have that many.

 Brachial valve
Pedicle valve

The Kalkberg formation is lower Devonian in age (Lockhovian to Pragian stage). I collected this specimen from a roadcut near Shoharie, NY.

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