Weno and Pawpaw Formations 37 



stone with packed laminated blue-gray shale, slate color when fresh, 

 but weathering to blackish-blue. 



Fossiliferous ironstone band .2 



Blue shale, laminated, jointed on weathering, very fossiliferous 19.8 



This layer contains an abundant nacreous shell fauna, including: 

 Gervilliopsis invaginata (White), Gryphea washitaensis Hill (juvenile 

 stages), Enallaster sp., Tellina sp., Corbula basiniformis Adkins, Nucula 

 wenoensis Adkins, Pecten inconspicuus Cragin, Anchura mudgeana 

 White, Natica sp., Turritella sp., Cerithium sp., etc. 

 Gray-blue arenaceous laminated shale, calcareous in part, forming a terrace 



in the pit. G. washitaensis, Gervilliopsis invaginata, Pecten, Plicatula .3 



Laminated blue shale '. .2 



Ironstone seam .1 



Laminated gray-blue shale 1.9 



This works down into kidney-shaped lumps, and is locally called 

 "kidney shale." 



Arenaceous laminated marl. Gryphea washitaensis abundant at top and 

 bottom. Main zone of Gervilliopsis invaginata (White), Trigonia clav- 

 igera Cragin, Pecten subalpinus Bose, Leiocidaris spines. This layer 



forms a secondary terrace .8 



Blue fossiliferous marl. Locally called "buff marl," a desirable brick ma- 

 terial, free from impurities, burns to buff color 11.2 



51. C 



This material has been thrown in heaps onto the terrace above and is rich in small 

 calcitic fossils, including: Venericardia wenoensis Adkins, Trochus laticonicus Adkins, 

 Trigonia clavigera Cragin, Neritina, Nerita, Pecten sp., worm tubes, minute corals 



In the bottom of the pit covered by water is about 30 feet more of Weno shale. 

 It is stated that the pit has at one point been dug 70 feet deep. A water well 

 nearby passed through the Denton marl into the Fort Worth limestone. The Dentor, 

 marl is poorly exposed one-fourth mile west of the pit, and the Fort Worth limestone 

 is finely exposed with its typical sequence of fossil zones, in the creeks between th( 

 brickyard and Gainesville. 



The Quarry limestone is variable in thickness. Blocks two to three feet 

 thick have been excavated from the pit and thrown in a heap above its 

 south rim. An extensive outcrop, with quarried indurated blocks, three 

 feet thick, occurs three miles east of Gainesville just north of the track. 

 The quarry group forms a persistent outcrop eastward to the river near the 

 the northeast corner of Graysoh County, in which county its relations 

 have been described by Stephenson. In Denton County on the Denton- 

 Krum road, it outcrops as a bench, and is 15 inches thick. Here it is 

 abundantly fossiliferous, and contains Pecten subalpinus, cidarid spines, 

 Ostrea marcoui, Gryphea washitaensis and Ostrea carinata. Beneath it 

 is a ferruginous and calcareous shell conglomerate layer 1 to 2 inches 

 thick consisting almost entirely of the last two species named. In Tarrant 



