Cirroceras nebrascense Ammonite

The Cirroceras nebrascense ammonite fossil displayed at the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania (July 2011). This fossil was probably found in South Dakota.  The creature swam the Western Interior seas of the Upper Cretaceous (Mesozoic Era).  Its Carnegie museum accession number is CM 29908.

Visit the Carnegie museum web site:  http://www.carnegiemnh.org/

View another specimen at the U.S. National Museum of Natural History: CLICK HERE

Placenticeras whitfieldi Ammonite

The Placenticeras whitfieldi ammonite fossil displayed at the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania (July 2011). This fossil was found in the Black Hills of South Dakota.  The creature swam the Western Interior seas of the Upper Cretaceous (Mesozoic Era).  Its Carnegie museum accession number is CM 29833.

Visit the Carnegie museum web site:  http://www.carnegiemnh.org/

Subretepora asperato-striata Bryozoan

While researching some Waldron Shale fossil identifications for members of the Fossil Forum, I came across this little gem. When I began collecting about 4 years ago, this is one of the first fossils I found.  It is from the Waldron Shale of Clark County, Indiana.  This Middle Silurian Period specimen is actually two fossils of distinction: the side not shown is a Favosites colony and the visible side is a little branching bryozoan.  The bryozoan appears to be a Subretepora asperato-striata as seen on this web site: http://bingweb.binghamton.edu/~kwilson/Silurian/RochesterShale/RSCorBry.htm

Thanks to Dave at Views of the Mahantango for sending me this link.