A pair of Pseudoatrypa from the Genshaw formation of Michigan

Once again, the ubiquitous fossil Pseudoatrypa sp. appears on my blog. This time the fossils come from the Genshaw formation near Alpena Michigan out of a large lot of material from an old collector.

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

Specimen #2

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

The Genshaw formation is part of the Traverse Group which is late Givetian stage within the middle Devonian.

Cyrtina umbonata from Michigan

This is a fossil Cyrtina that I received in a large lot of fossil material from an old collection. It had a label with it that stated the fossil was from the Genshaw formation near Alpena, Michigan. Based on my searches for Cyrtina sp. from the Genshaw formation on the Friends of the University of Michigan Museum of Paleontology website (HERE or a slightly easier interface HERE), I think this is a Cyrtina umbonata.

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

The Genshaw formation is part of the Traverse Group which is late Givetian stage within the middle Devonian.