Parker County, Texas
February 1, 2009

Today Me and Roz hunted an exposure of the Walnut formation in Parker County, Texas.  Here you can see the dramatic change between the limestone/marl of the Walnut formation and the sandstone of the underlying Paluxy formation.
 
(pic by Roz)
Engonoceras ammonite
Ceratostreon weatherfordensis? oyster
Roz's Holectypus echinoid

(pic by Roz)
(same)

(pic by Roz)
Roz's other Holectypus echinoid

(pic by Roz)
Arca? clam (internal mold)
 
(same)
 Roz's Salenia mexicana? echinoid
 Heteraster echinoid