24 University of Texas Bulletin 



Lime facies (conglomerate): 



Fink, Grayson County, Texas, to east of Hugo, Oklahoma. Coincident- 

 ally on passing eastwards and northwards from the marl facies the scat- 

 tered shells in the formation become consolidated into conglomeratic sheets 

 with shelly marl between, and these predominate at Gainesville and Deni- 

 son. Turning east down the Red River Valley the thickness of the Kia- 

 mitia and the amount of this conglomerate greatly increase. Near Hugo, 

 Oklahoma, the Kiamitia shell conglomerate is about 150 feet thick and is 

 extensively used for crushed rock. This formation is a shallow water 

 oyster bed deposit of mixed Fredericksburg and Washita fossils, mainly 

 the former. 



The formation disappears at the Brazos-Colorado uplift, and in West 

 Texas its relations are unknown. 



EDWARDS FORMATION 



The Fredericksburg Division also must be considered sectionally, since 

 its various parts behave differently as to their changes of thickness and 

 lithology. 



Sand facies: 



Unknown. 



Clay facies: 



Unknown. 



Marl facies: 



Unknown. Bose's subdivision 3 at Cerro de Muleros contains some 

 marl, but this subdivision is not positively known to be Edwards. Through- 

 out the Red River region and North-Central Texas, the top of the Good- 

 land, which is thought to correspond to the Edwards, is a non-marly lime- 

 stone, usually massive and sometimes crystalline. North of Sheffield and 

 Fort Stockton, the Fredericksburg is stated to be prevailingly marly. 



Limestone facies: 



This is known from Fort Worth south to the turning point of the out- 

 crop in Bexar County, and thence west to El Paso. The Red River ex- 

 tension of this level is not identifiable with certainty because it is not 

 clear whether the 12-20 feet of white limestone at the top of the Fredericks- 

 burg division as seen at Denison or north of Goodland, Oklahoma, repre- 

 sents only the Edwards or also in part still lower Fredericksburg. The 

 Edwards is less than 10 feet thick at Fort Worth; it is 33 feet thick at 

 Comanche Peak, and southwards thickens rapidly. 



Rudistid facies: 



The Rudistids invaded Texas most widely in upper Fredericksburg time, 

 when they were scattered as far north as Fort Worth ; however, they are 

 very rare and inconspicuous north of the Brazos, in Central Texas. In 



