Tres Hermanos Formation (Atarque Sandstone Member) (NM)
Cenomanian
Dakota Sandstone (NM)
Dakota Sandstone (Oak Canyon Member) (NM)
Woodbine Formation (TX)
Woodbine Formation (Templeton Member) (TX)
Psilomya concentrica from the Cenomanian Woodbine Fm. of Texas (Stephenson 1953). Psilomya concentrica from the Cenomanian Woodbine Fm. of Texas (Stephenson 1953).