Weno and Pawpaw Formations 29 



In the creek, one-fourth mile west of the mountain, the contact between the Duck 

 Creek marl and the Fort Worth limestone is exposed as at Caddo, Oklahoma. 



In the second cut 1V miles north of Hugo, Oklahoma, there is 10 inches 

 of shell conglomerate containing abundant juvenile and adult Ostrea 

 quadriplicata Shumard, Gryphea washitaensis Hill, Plicatula sp., Pecten 

 subalpinus (Bose), abundant Leiocidaris spines, Corbula littoralis Adkins, 

 and other typical upper Weno fossils as found at Gainesville and Denison. 

 This represents part of the Quarry limestone group. Above it is an iron- 

 stone ledge, 4 inches thick, which is red-stained and conglomeratic and re- 

 sembles the basal Pawpaw as seen at Gainesville. 



Along the St. Louis and San Francisco Railway track between Benning- 

 ton and Bokchito, Oklahoma, the upper Washita section, Woodbine to 

 Weno, is seen to advantage. The Grayson marl with an estimated thick- 

 ness of 50 feet is well developed with its characteristic fossils. 1 



The Mainstreet limestone is seen in roadside cuts one mile northwest of 

 Bennington, in the caprock of Sugarloaf Mountain, six miles north of Ben- 

 nington, in the bed of Sulphur Creek, where it forms an extensive pave- 

 ment limestone, and in the railroad cuts nearby, particularly in the long 

 cut running west down to Bokchito Creek, which has it well exposed. 

 Everywhere it is underlain by the brown consolidated Pawpaw sandstone. 

 The nature of the Pawpaw and Weno outcrops in this region is seen from 

 the following section. 



SECTION OF CUT NEAR SULPHUR CREEK, ON THE ST. LOUIS AND SAN 

 FRANCISCO RAILWAY, TWO MILES WEST OF BENNINGTON, OKLAHOMA 



MAINSTREET: Feet 



Brown limestone with Turrilites brazoensis, Pecten subalpinus, Exogyra sp. 

 (large), and ammonites. The top of the exposure is an Exogyra 



arietina conglomerate. Exposed 2 



Brown-blue limestone with irregular sandy inclusions 1 



Yellow limestone containing Kingena wacoensis, Ostrea marcoui, and Pecten 



subalpinus 1 . B 



'Taff (U. S. G. S. Geologic Atlas of the United States, Atoka Folio, No. 79) has 

 overlooked the Grayson marl, which in this quadrangle is typically developed as at 

 Denison. It may be seen near the Woodbine ("Silo") sandstone knob mapped by Tafl 

 one mile northwest of Bennington, Oklahoma, where it overlies typical Mainstreet 

 limestone containing Turrilites brazoensis Roemer, Exogyra arietina Roemer and othei 

 distinctive fossils, and contains Gryphea mucronata Gabb, Gryphea, sp. (truncate) 

 Pecten subalpimts (Bose), Plicatula sp., Ostrea sp. aff. subovafa. Shumard, and 

 Kngonoceras sp. This locality is mentioned by Taff, ibid., p. 6. It also forms the 

 overburden in the Mainstreet quarry one mile north of Durant, Oklahoma, where it 

 is very fossiliferous. 



