R. T. Hill — Texas Section of American Cretaceous. 305 



Fauna of the Lower or Fredericksburg Division. 



Orbitulites texanus Roem. 

 Gryphma Pitcheri Mort. (Type 



form., 

 G. Pitch'eri Mort.? Marcou. 

 Exogyra texana Roem. 

 Ostrea, sp. ind. 

 Anomia, sp. ind. 

 Janira occiclentalis Con. 

 Cardium brazosense Shum. 

 Cardium Hillanum Sow. 



C. texanus Con. 



C. coloradoense Shum. 



C. multistriatum Shum. 



G. sancta-sabea Roem. 

 Cythereaf Shum. 

 Pholadomya sancta-sabm Roem 

 Pholadomya pedernalis Roem. 

 Lima wacoensis Roem. 

 Arcopagia texana Roem. 

 Cypricardia pedernalis Roem. 

 Trigonia crenulata (?) Roem., 



Lam. 

 Solen irradians Roem. 

 Astarte lineolata Roem. 

 Cardita eminula Con. 

 Avioida convexo-plana Roem. 

 Avicula pedernalis Roem. 

 Mytilus tenuitesta Roem. 

 Homomya alta Roem. 

 Corbida occidentalism 

 Corbis, Roem. 

 Modiola con centrico-costellata 



Roem. 

 Modiola pedernalis Roem. 



Pinna, sp. ind., Roem. 

 Leda, sp. ind., Roem. 

 Venus, sp. ind., Roem. 

 Thracia, sp. ind., Roem. 

 Panopara Newberryi Shum. 

 Actwonella dolium Roem. 

 Scalaria texana. 

 Phasianellaf perovata Shum. 

 Phasia?iella tumicla. 

 Globiconcha coniformis Roem. 

 Globiconcha? elevata Shum. 

 Rostellaria (Fulirna) Shum. sub- 



fusiformis. 

 Natica {Lunatia?) pedernalis. 

 Naticaf (Lunatia) acutaspira 



Shum. 

 Nerinea acus, Roem. 

 JSTerinea, sp. ind., Roem. 

 Avellanaf texana Shum. 

 Turritella, seriatim-granulata 



Roem. 

 Cerithium? bosquense Shum. 

 Cerithium ? sp. ind., Roem. 

 Pleurotomara, sp. ind., Roem. 

 Solarium ? sp. ind., Roem. 

 Heter aster ( Toxaster) texanus 



Roem. 

 LTolectypus planatus Roem. 

 Cyphosoma texana Roem. 

 Pseudodiadema texana Roem. 

 Ammonites acuto-carinatus 



Shum. 

 Ammonites ? pedernalis von 



Buch (not Binkhorst). 



The basal contacts of this division have been observed in 

 numerous places, and present many variations. West of the 99th 

 meridian it usually rests upon the red beds of the Jura- 

 Trias. East of this it usually rests directly upon the un- 

 doubted Carboniferous, excepting in the Archaean area of Bur- 

 nett and surrounding counties, where, according to Mr. W. P. 

 Cummins, it can be seen resting on the Carboniferous, the Si- 

 lurian, the Cambrian, and in places upon the granite, all of 

 which shows an eroded exposure of many formations pre- 

 vious to the subsidence resulting in its deposition. In the 

 trans-Pecos region the formation may be seen resting upon the 

 almost vertical strata of the upturned Paleozoic. The basal, 

 or Dinosaur sands of my section, which are interpolated 



Am. Jour. Sci.— Third Series, Vol. XXXIV, No. 202.— Oct., 1887. 

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