Phylum: Mollusca (Mollusks)

Class: Bivalvia - Bivalves - Pelecypods 
Subclass Heterodonta 
(clams, rudists, mussels)

Pennsylvanian Period:  (click for Cretaceous Period)
Nucula sp. ? clam (Roz) Strata: Palo Pinto or Wolf Mountain? Period:  Pennsylvanian (c. 303-304 mya) Loc: Palo Pinto Co., TX.  Aug. 8, 2009.	Nuculopsis sp. Strata: Palo Pinto or Wolf Mountain? Period:  Pennsylvanian (c. 303-304 mya) Loc: Palo Pinto Co., TX.  Aug. 8, 2009.
Phestia sp. Strata: Palo Pinto or Wolf Mountain? Period:  Pennsylvanian (c. 303-304 mya) Loc: Palo Pinto Co., TX.  Aug. 8, 2009.	?? clam Strata: Graham (Finis shale) Period: Pennsylvanian Loc: Jack Co., TX.  Sept. 27, 2008.
Myalina sp. clams  (by Roz M)   Strata: Graham (Jacksboro limestone?) Period: Pennsylvanian Loc: Jack Co., TX.  Nov. 13, 2007.	Pteronites percuata clam Strata: Graham (Finis shale) Period: Pennsylvanian Loc: Jack Co., TX. Sept. 27, 2008.
Astartella concentra Strata: Mineral Wells (Salesville sh.) Period: Pennsylvanian Loc: Palo Pinto Co., TX.  Dec. 22, 2005.	Allorisma sp. Strata: Graham (Finis shale) Period: Pennsylvanian Loc: Jack Co., TX. March 20, 2011.
Astartella varica Strata: Mineral Wells  Period:  Pennsylvanian  (c. 300 mya) Location: Palo Pinto Co., TX. May 8, 2010.