Friday, February 17, 2012

Sowerbyella brachiopod from the Verulam fm.

Sowerbyella is another common brachiopod in the Verulam formation. It's not as prolific as Dalmanella but can be found in similar layers. Sowerbyella is most easily recognized by the rectangular outline of the smooth, unornamented shell. It has a long hinge line and a concave brachial valve that parallels the convex pedicle valve, as is typical of the Strophomenida order of brachiopods.

Specimen #1
Pedicle valve

Anterior

Brachial valve

Posterior

Profile

Specimen #2
Pedicle valve

Anterior

Brachial valve

Posterior

Profile

Both specimens shown above were collected from the Verulam formation near Brechin, Ontario. The Verulam formation is Ordovician (Katian/Mohawkian) in age.

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