Weno and Pawpaw Formations 59 



*Nerinea sp. 



Lunatia sp. 

 Natica sp. 



Goniophorus sp. 



Pecten subalpinus Bose. 



Turrilites brazoensis Roemer. 



The Del Rio pyrite fauna corresponding to the base of the Grayson 

 formation of North Texas has already been noted; it includes: 



* Turrilites bosquensis Adkins. 

 *Flickia (?) bosquensis Adkins. 

 Acanthoceras worthense Adkins. 

 *Schloenbachia sp. 



Exogyra arietina Roemer. 



Gryphea mucronata Gabb. 



Gryphea sp. 



Pecten subalpinus (Bose). 



The first named limonite fauna with an extensive calcite microfauna 

 immediately overlies the Georgetown limestone and is of middle Main- 

 street age. It is seen at South Bosque, and will probably be discovered 

 at many places in Central Texas. 



Liddle states that the Del Rio clay throughout Medina County, contains 

 great amounts "of dark brown limonitic fragments and fossils.' Good 

 localities are a small Del Rio inlier four miles slightly west of north of 

 Quihi on the Bandera road, and the main area of exposure just north of 

 the inlier. These localities contain limonitic gastropods, *Turrihtes, *Sca- 

 phites, small ammonites, and loose *Nodosaria. 



At Loma de la Cruz and other localities in the Del Rio clay lowland two 

 miles south and southeast of Del Rio, the basal clay contains limonitic 

 *Schloenbachia sp., *Hamites sp., *Scaphites sp., *Turrilites (two species), 

 *sp. aff. Flickia ( ?) bosquensis Adkins ; *Pyrina or Cassidulus sp., cidarid 

 sp., *Leda (two species) , *Nucvla sp., *Arca sp. *Plicatula sp. ; *Nerinea 

 sp. (abundant), *Cerithium spp. and other fossils. 



Along the base of the Reed Plateau, Terlingua, the basal Del Rio clay 

 contains abundant brown limonite fossils, the great majority of which are 

 various species of Turrilites. The fauna includes : *Nodosaria texana 

 Conrad, *T:irrilites (three species), * Acanthoceras sp., *Schloenbachia sp. ; 

 *Nucida sp. 



'Liddle, The Geology and Mineral Resources of Medina County, Univ. Texas Bull, 

 (in press). 



