^1 Stiah/ f>f the Bilridcre Beds. — CviKjIii. 385 
Dentou (of Taflf). 
Washita (of Shuniai'd). Fort Worth (of Hill). 
Duck Creek (of Hill). 
Kiowa (of Crasin ) Tucumcari (of Cragin). 
Kianiitia (of Hill). 
Barton Creek (of Cragin). ( Caprina autl 
Caprotiua, of Shumard.) 
Fredcrieksburo- (of Hilli. Comanche Peak (of Shumard). 
Walnut (of Hill). ( Exogyra texana. of 
Shumard.) 
Paluxy (of Taff). 
Bosque (of Taff). Glen Rose (of Hill). 
Trinity (of Hill.) 
The Barton limestone includes the Caprina limestone and 
the Caprotina limestone of Dr. Shumard. It is named from 
Barton creek, on which, near Austin, Texas, it has its finest 
paleontological expression. It is on Barton creek that Mr. 
George StoUej obtained froln this limestone the collection of 
beautiful calcite fossils that constituted the basis of Dr. 
Roeraer's final contribution to Texas paleontology.* 
The AVashita division, as here defined and as used in this 
paper, includes a group nearlj'- equivalent to that which Dr. 
Shumard defined as "the Washita limestone," differing from it 
onl^'in excluding the Tucumcari terrane. Most divisions are 
arbitrai-y, or only in part natural ; and Dr. Shumard's Wasli- 
ita, with the slight modification here adopted, is as natural as 
any of the divisions of the Comanche series hitherto proposed. 
I)i-. Shumard's Arietina (for which Prof. Hill's geographic- 
ally derived name, Uenison, is properly retained) is of eqiud 
importance with the Washita, and is quite too well difierenti- 
ated and large a group of sediments to be swallowed tip by the 
name of the latter. J f it be needful to sometimes use a col- 
lective name for the Washita and the Denison, an unpre((ccu- 
pied name must \n- I'ound; and for such use the name Gaines- 
r/ffc. from the north Texas town of that name, which practi- 
cally marks the boundary between the Washita and the 
Denison, is appropriate. 
*Ueber eine durch die Haufigkeit Hip{)uriten-artiger Chainiden aus- 
gezeiehnete Faiuia dcr obcrturoiicn Krcide von Texas. Ferdinand 
Roemer. In Paleontologische Abhandlungen von Dames uiid Kavser, 
vierter Band, Heft 4. Berlin, 1888. 
