Weno and Pawpaw Formations 23 



Marl facie* : 



This facies invades the limestone series at Gainesville, Texas, where 

 all of the lower Duck Creek except the basal ten feet is prevailingly marly. 

 Probably the removed portion of the Duck Creek west and north of the 

 outcrop was prevailingly marly. 



Limestone facie*: 



Extends from Denton County southward to the turning point of the 

 Comanchean outcrop in Bexar County, and thence westward to the Trans- 

 Pecos region. The group of strata is composite and at a given point is 

 more marly above than below. For instance, at Denison the Hamites and 

 Desmoceras zones are prevailingly limy marl with some blue shale, and at 

 Denison the zone of Desmoceras brazoense is marly at the top; at Fort 

 Worth the section is limestone to the top of the Schloenbachia trinodosa 

 horizon and limy even above this ; while below the Brazos the whole lower 

 Duck Creek section becomes limy. 



South of the Brazos the Duck Creek formation lies at the base of the 

 Georgetown limestone where it is a chalky white indurated rather un- 

 fossiliferous limestone, differing considerably in appearance at Austin 

 and at Georgetown, Texas; while west of the southern turning point of 

 the outcrop it becomes a hard, crystalline, consolidated, sparsely fossilifer- 

 ous limestone. At Cerro de Muleros near El Paso, on the contrary, the 

 northern littoral facies is present as at Gainesville and Denison and this 

 level is represented by a series of clay, marl and limestone, which repre- 

 sents a transitional facies. Vraconian faunae from Chihuahua and Zaca- 

 tecas (p. 60) represent in part this stratigraphic level. 



KIAMITIA FORMATION 

 Sand facie*: 



Unknown. 



Clay (abate) facie*: 



From near Primrose, southwestern Tarrant County, south througn 

 Johnson County to beyond the Brazos. This formation at Blum, Hill 

 County, is a yellowish clay 19 feet thick. This facies contains a con- 

 spicuous limonite fauna, Schloenbachia, Area, small gastropods and pelecy- 

 pods and other fossils. 



Marl facie*: 



Southern Tarrant County to between Gainesville and Fink. The forma- 

 tion is increasing in thickness northwards and as the clay facies disap- 

 pears, flag layers enter first as limestone in thin sheets and farther north 

 as shell conglomerate sheets. The bulk of the formation is marl, and the 

 limonite fauna has largely disappeared. 



