Class: Cephalopoda
unranked group: Belemnoidea (belemnites)
| Belemnites (or belemnoids) are an extinct group of marine cephalopod, very similar in many ways to the modern squid and closely related to the modern cuttlefish. Normally with fossil belemnites only the back part of the shell (called the guard or rostrum) is found. The guard is elongated and bullet-shaped, being cylindrical and either pointed or rounded at one end. From: Wikipedia | |
  Strata: Duck Creek / Fort Worth Period: Cretaceous(c. 100 mya) Loc: Denton Co., TX. 24 March 2019. |
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| The following may or may not be belemnites. | |
 Strata: Graham Period: Pennsylvanian (c. 300 mya) Loc: Jack Co., TX. April 24, 2010. |
Strata: Graham Period: Pennsylvanian (c. 300 mya) Loc: Jack Co., TX. April 24, 2010. (found by Roz M) |