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.

Jack County, TX 

Brachycycloceras #571

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Brachycycloceras #980c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Domatoceras #480

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Euloxoceras

Graham (Finis Shale)

Jacksboro, Jack Co., TX

 

Gonioloboceras #428

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #222c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Brachycycloceras #571

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Domatoceras #480

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Eoasianites #345

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Euloxoceras #281

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #922d

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #922b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Brachycycloceras #921

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Domatoceras #979b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Eoasianites #438

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #922a

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #935c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #222

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Brachycycloceras #980

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Domatoceras #979b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Eoasianites #438 Graham (Finis Shale) Jacksboro, Jack Co., TX

Eoasianites #438

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Eoasianites #930

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #223

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #440

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #446

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #440c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #935

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #440 reverse

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #835e

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #564

Graham (Finis Shale)

Jacksboro, Jack Co., TX

 Gonioloboceras #977

Graham (Finis Shale)

Jacksboro, Jack Co., TX

 

Gonioloboceras #942

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #935b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Metacoceras #567

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Metacoceras #918c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Neodimorphoceras #835a

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Gonioloboceras #564b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Metacoceras Reverse #567

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Metacoceras #976m

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Neodimorphoceras #835c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Knightites tennulieata #565

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Metacoceras #918a

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Neodimorphoceras #835b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Shimanskya postremus#224

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Knightites tennulieata #565

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Metacoceras #918b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Neodimorphoceras #428

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Shimanskya postremus #563

Graham (Finis Shale)

Jacksboro, Jack Co., TX

 Shimanskya postremus#426

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Shimanskya postremus #426

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #843b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedothoceras #480

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #843

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #452

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969g

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969f

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #563d

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #843c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969l

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969a

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #563c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969a

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969k

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #563b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969d

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969i

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969h

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #969m

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Psuedorthoceras #426

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #928f

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #928a

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #928a

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #928e

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Tainoceras #976g

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Tainoceras #427

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #941

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #928b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Tainoceras #976e

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Uddenites sp. #977

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #928c

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Tainoceras #976l

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Tainoceras #916b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Uddenites sp. #977b

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Pseudorthoceras #928d

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Tainoceras #832f

Graham (Finis Shale)

Jacksboro, Jack Co., TX

Tainoceras #976a

Graham (Finis Shale)

Jacksboro, Jack Co., TX