28 University of Texas Bulletin 



Near Gainesville, the formation is a series of thickbedded, hard, ferru- 

 ginous sandstones with interbedded, laminated impregnated sandy layers 

 and semi-consolidated iron-impregnated sand. The layers are locally a 

 shell conglomerate containing great quantities of casts of Area, Turritella 

 and other bivalves and gastropods. The basal layers are characterized by 

 an abundant pyrite fauna. Turrilites, Scaphites, Hamites and echinoids 

 are rare or absent. This type of lithology continues around the turning 

 point of the Comanchean formations south of Orlena to a point near Potts- 

 boro; and at Denison the Pawpaw formation is almost entirely a coarse 

 consolidated brownish-red sand with few fossils. At Durant the formation 

 is similar to the Denison exposures. Eastward through Bennington and 

 Bokchito the sandy phase continues, and is included in the Bokchito for- 

 mation of Taff. 



SECTION OF SUGAR LOAF MOUNTAIN, BRYAN COUNTY, OKLA-HOMA 

 Section 22, R. 12 E., T. 5 S. (furnished by W. M. Winton) 



MAINSTREET: 



Limestone, iron stained, old cap of hill, practically removed by weathering. 



Feet 

 PAWPAW: 



Massive yellow red sandstone, soft in fresh exposures, indurated where long 



exposed ; no fossils seen 5.0 



Soft limonitic sand ; no fossils seen 30 . 



Ironstone ledge composed of fossils (Area sp., Ostrea quadriplicata, small 



ammonites, gastropods, etc., a typical Pawpaw fauna) 0.5 



Red sand, cross bedded and containing lenticular hard masses of sandstone 10.0 

 Ironstone ledge composed of fossils (Area sp., Ostrea quadriplicata, am- 

 monites, Nodosaria, etc., a typical Pawpaw fauna) 0.8 



Red sand 10.0 



WENO: 



Yellowish hard limestone with typical Weno fossils 0.8 



Soft marl ; no fossils seen 0.3 



Very hard massive limestone, pinkish in color. Large numbers of fossils 

 having same hardness as matrix and giving uniform fracture. Ledge 

 forms conspicuous topographic break traceable for miles. Schloenbachia 



sp. M., and other typical Weno fossils 1.9 



Soft marl 15.0 



Limestone ledge sandy; no fossils seen 1.0 



Soft marl with a few thin limestone ledges, each less than 0.5 feet thick 95.0 



DENTON: 



Conglomerate of Gryphea washitaensis, Ostrea carinata, and other Denton 

 fossils. Typical Denton marl ("Caddo" limestone of Taff, top). Ex- 

 posed, about < 2.0 



