20 University of Texas Bulletin 



PAWPAW FORMATION 



The Pawpaw formation shows along its north-south outcrop an almost 

 idealized sequence of marine facies. 



Sand facies: 



Red River Valley, as far south as the southern border of Cooke County, 

 Texas. 



Clay faciet: 



Denton, Tarrant and Johnson counties, Texas, to near Riovista. 



Marl faciei: 



Johnson and Hill counties, Texas. 



Limestone facies: 



The equivalents of the Pawpaw south of the Brazos are questionable. 

 If it is represented in this region, it is the upper part of the Georgetown 

 limestone. (See page 11.) 



In West Texas its exact equivalent is unknown. At Cerro de Muleros 

 however a distinct Weno and possibly Pawpaw fauna are present in Bose's 

 subdivision 6, but not enough distinctive Pawpaw species are recorded to 

 decide how much of this subdivision represents it. A hiatus at the base 

 and at the top of the Pawpaw has been noted by Stephenson, 1 near the Red 

 River, but it is unlikely that this accounts for any great thickness of Wash- 

 ita sediments. 



WENO FORMATION 

 Sand facies: 



There is sand in the upper half of the Weno, in the Red River Valley, 

 Denison, Cedar Mills, Gainesville, Texas. In the lower half of the Weno : 

 unknown. At Tucumcari, New Mexico, Dr. Bb'se found a sandstone, prob- 

 ably Weno-Pawpaw, containing Ostrea quadriplicata Shumard, TurriteUa 

 sp., Protocardia multistriata (Shumard), Protocardia sp. aff. texana 

 (Conrad), Gryphea dilatata Marcou 2 and other fossils. 



Clay (shale) facies: 



Red River Valley, Gainesville and Denison, Texas. Contains a few thin 

 ironstone seams; southward and to a less extent eastward this facies be- 

 comes marly and is intercalated with thin limestone seams. 



Marl facies: 



Denton, Tarrant, Johnson and Hill counties, Texas. The upper half 

 of the Weno is limy at places (as Fort Worth) where the lower half is 

 marly. The formation is prevailingly of limestone throughout, south 



'Stephenson: U. S. G. S., Prof. Paper 120-H, p. 143. 



2 Marcou: Geology of North America, plate IV, figures 1, la, 3, 1842. 



