Weno and Pawpaw Formations 21 



of the Brazos River. In West Texas at Cerro de Muleros, the Weno is rep- 

 sented in Bose's subdivision 6, which consists of marls, sandstone and lime- 

 stone. This series is therefore composite and transitional, like the Weno 

 at Gainesville and Denison, and contains many identical fossils. 



Limestone facies: 



Portion of the Georgetown limestone near top, south of the Brazos. An 

 indurated, massive limestone facies is unknown but probably lies to the 

 east and south of the outcrop in Central Texas. 



DENTON FORMATION 

 Sand facie*: 



Unknown. 



Clay facies: 



From Blue Mound, near Haslet, Tarrant County, Texas, northward to 

 Denison. Contains pyrite and crustacean fauna. 



Marl facie*: 



In North-Central Texas along the outcrop the marl facies appears below 

 Blue Mound, just north of Fort Worth and continues southward. In 

 southern Oklahoma, the Red River Valley and Central Texas north of the 

 Brazos, this formation is a clay, slightly arenaceous at the base and capped 

 by shell conglomerate. This conglomerate is much more conspicuous at 

 the Red River than at Fort Worth and southward, where it has largely 

 disappeared, leaving a very shelly marl. South of the Brazos River, near 

 Waco, there is a transitional zone between the marl and the limestone 



facies. 



At Cerro de Muleros a portion of subdivision 5 is a gray marl containing 

 great numbers of Gryphea washitaensis Hill, and represents the Denton. 



Limestone facie*: 



The portion of the Georgetown limestone which represents the Denton 

 formation is a consolidated shelly limestone with very little calcareous 

 cementing material, and usually massive without marl interbedding. It 

 extends from a point near Waco southwards to the turning point of the 

 Comanchean outcrops in Bexar County and thence westward to beyond 

 the Pecos River. In the El Paso region, however, the equivalent to the 

 Denton belongs to the northern (littoral-bathyal) facies and is marly as 

 in North Texas. 



FORT WORTH FORMATION 



This formation is calcareous over all of North and Central Texas but is 

 somewhat marly in the Red River valley and is prevailingly marly near El 



