Ammonites and Nautiloids - Jack Co., TX
Kingdom: Animalia, Phylum: Mollusca, Class: Cephalopoda, SubClass: Ammonoidea, Order: Goniatitida
Kingdom: Animalia, Phylum: Mollusca, Class: Cephalopoda, SubClass: Nautiloidea, Order: Nautilida
In Jack Co., TX near Jacksboro, we found a large straight cephalopod Pseudorthoceras. In addition, we found several Gonioloboceras, showing their typical suture patterns, and several other ammonoids and nautiloids including Tainoceras, Metacoceras, and the straight Euloxoceras greeni. We also found many Rugobactrites similar to the one shown below. These specimens are from the Pennsylvanian, Graham Formation, Finis Shale member (c. 300mya).
Click on images to enlarge. All measurements are in centimeters unless otherwise shown.