In the past, this gastropod was known as Bellerophon (Pharkidonotus). The name in parenthesis is due to subgenera naming. In modern gastropod taxonomy, several sub and super-names are used, including unranked groups that don’t fall into a classic hierarchy. McCoy named the family Bellerophontidae in 1852 in the publication “DescriptionRead More →

Poterioceras curtum is a Pennsylvanian cephalopod first described by Meek & Worthen in 1860. I originally misidentified these as Ctenobactrites isogramma. This is not the first report of this species in Western Pennsylvania. A report from the Annals of the Carnegie Museum in 1947 features specimens from the Brush CreekRead More →

Finding specimens of the paleozoic cephalopod genus Domatoceras in local rocks is difficult. They exist, but the genera Metacoceras and Pseudorthoceras dominate the cephalopod fauna. They are large cephalopods with a narrow venter. The younger whorls are only slightly or not impressed into the umbilical walls. Big shells are hardRead More →

While extensively researching the Paleozoic shark genus Petalodus, I uncovered many holotype specimens. Yet, in searching, there are still a couple I have been unable to locate. Not finding some is not surprising; all the missing holotypes were described during the 19th century and the 1800s. I have spent theRead More →

Strobeus primigenius

In doing broader research on three species of Strobeus that occur within the Glenshaw Formation in Western Pennsylvania, I have discovered many excellent plates by former authors. These plates are miniature works of art, capturing details of these fossil gastropods that may not be available in photographs. The art canRead More →

An excellent specimen of Trepospira sphaerulata was recovered in late December 2021. It is a much better example of this species of Paleozoic gastropod, so I am replacing the content of this article with photos of it. New images should help future researchers search for an excellent example of thisRead More →

Fossilized Paleozoic Ammonoids are a rare find in the Glenshaw Formation. When recovered, these specimens can be challenging to identify. I have recovered a few ammonoids, but as far as volume goes, the nautiloids rule the available fauna. I found my first ammonoid early, but I could not identify itRead More →