Phylum: Echinodermata

Class: Echinoidea - Echinoids
(regular echinoids)

Pennsylvanian Period (click for Cretaceous Period)
Archaeocidaris sp. echinoid plates Strata: Graham (Finis shale) Period:  Pennsylvanian  (c. 300 mya) Loc:  Young Co., TX.  2 Feb 2020.	Archaeocidaris sp. echinoid plates Strata: Graham (Finis shale) Period:  Pennsylvanian  (c. 300 mya) Loc:  Young Co., TX.  2 Feb 2020.
Archaeocidaris sp. echinoid plates Strata: Mineral Wells (Salesville shale) Period:  Pennsylvanian  (c. 300 mya) Loc:  Palo Pinto Co., TX.  Jan. 27, 2007.	Archaeocidaris sp. echinoid spines Strata: Mineral Wells (Salesville shale) Period:  Pennsylvanian  (c. 300 mya) Loc:  Palo Pinto Co., TX.  Jan. 27, 2007.
Echinoid spines Strata:  Lake Bridgeport Shale Period:  Pennsylvanian  (c. 300 mya) Loc:  2006.	Echinoid spines and plates Strata:  Lake Bridgeport Shale Period:  Pennsylvanian  (c. 300 mya) Loc:  Wise Co., TX.  Jan. 27, 2007.