30 University of Texas Bulletin 



PAWPAW: 



Consolidated brown sandstone, no fossils seen 5 



Unconsolidated sand, iron stained 10 



Blue jointed clay with scattered Gryphea 10 



!<ed-brown sandstone calcareous in part with nacreous and ironstone fos- 

 sils: Area, Nucula sp., Corbula sp., Cerithium, Turritella, Anchura, 



like the Gainesville and Denison nacreous fauna 1 



Marl, containing ironstone seams, no fossils seen 10 



The cut east of the Bokchito Creek bridge shows the foregoing section 

 much better exposed. Pawpaw exposures were also noted near Durant, 

 Oklahoma. North of the railroad, 11/2 miles east of Bennington, Oklahoma, 

 about 50 feet of massive brown sandstone was noted underlying the Main- 

 street limestone at the top of the hill. This sandstone contains limy layers 

 bearing Ostrea quadriplicata, 0. subovata(l), marcoui, Trigonia sp., Gry- 

 phea sp., and Pecten sp. (large). Taff gives the following section for his 

 Bokchito formation in the Atoka and Tishomingo quadrangles 1 : 



SECTION OP THE BOKCHITO FORMATION IN THE ATOKA AND TISHOMINGC 



(OKLAHOMA) QUADRANGLES 



J. A. Taff, 1902-1903 



Feet 



4. Sandy and clay shales, and locally friable, cross bedded sandstone. In the 

 clay and in some of the iron and lime concretions, shells are preserved 

 with original nacre 50 



3. Hard, semi-crystalline, bluish, oyster shell limestone, weathering yellowish 



and projecting as ledges separated by friable shales 10-20 



- 2. Friable sandstone beds, locally cross bedded, alternating with and including 



deposits of sandy clay 20-3C 



1. Sandy clay shale, with ferruginous limestone segregations and ironstone 



nodules 90 



170-190 



This thickness is given as 140 feet in the texts and the Columnar Section sheets of 

 both folios. 



The upper member (4) of this section is probably Pawpaw. Sheets of 

 nacreous shells in the Pawpaw have been noted in Grayson County. The 

 other three members are Weno. 



The Pawpaw formation is exposed in the hilltops east of Denison and 



iTaff: U. S. G. S., Geologic Atlas of the United States, Atoka Folio No. 79, 1902. 

 p. 6; and, Tishomingo Folio, No. 98, 1903, p. 6. 



