Ceraurus? Trilobite Fossil

 

A few weekends ago, I was able to attend a field trip to Napoleon, Indiana USA. While there, I found this partial trilobite fossil which might be a Ceraurus (Chierurus) niagarensis (Hall, 1870). It dates to the Silurian Period  (Telychian to Sheinwoodian stage) in age. The fossil I was looking for this trip was that of the trilobite Spathacalymene nasuta (Ulrich, 1879).

According to Dr. James Thomka, professor at SUNY Plattsburgh, it is "from the mudstone lithofacies of the Massie Formation (long known as the "upper Osgood shale"), which is renowned for its 'cystoid' fauna."

 

Holocystites gyrinus Cystoid

 

A few weekends ago, I was able to attend a field trip to Napoleon, Indiana USA. While there, I found this fossil which appears to be a Holocystites gyrinus (Miller & Gurley, 1894) cystoid. It dates to the Silurian Period  (Telychian to Sheinwoodian stage) in age. The locality is world famous for this type of fossil. This specimen should be prepped to reveal more surface texture.

According to Dr. James Thomka, professor at SUNY Plattsburgh, it is "from the mudstone lithofacies of the Massie Formation (long known as the "upper Osgood shale"), which is renowned for its 'cystoid' fauna."

 

Silurian Coral Growing on Crinoid Stem

 A couple of weekends ago, I was able to attend a field trip to Napoleon, Indiana USA. While there, I found this fossil which appears to be a coral fossil coating a crinoid? stem fossil. It dates to the Silurian Period  (Telychian to Sheinwoodian stage) in age.

According to Dr. James Thomka, professor at SUNY Plattsburgh, it is "from the mudstone lithofacies of the Massie Formation (long known as the "upper Osgood shale").