854 DRAKE— THE GEOLOGY OF INDIAN TEKRITOKY. [Sept. 3, 



Stone. The lithologic characteristics of this limestone are quite 

 uniform throughout its extent and are such as to contrast it sharply 

 with the limestones of the associated beds. It varies in thickness 

 from an inch to thirty feet. Along Grand river east of Wagoner, 

 Chouteau and Pryor creek, it is twenty to thirty feet thick ; far- 

 ther northward and southeastward it is usually but five to ten feet 

 thick. This bed is apparently confined to the Indian Territory, 

 since it was not observed north of Vinita and was not noted in 

 Arkansas by the Geological Survey of that State. There is, how- 

 ever, a stratum of limestone about a foot thick in the Fayetteville 

 shale three miles southeast of Westville, which from its position 

 and lithologic characteristics, appears to be this bed. 



In the Fayetteville shale exposed around the hillsides southwest 

 of Bunch and along Illinois river east of Greenleaf this limestone 

 occurs almost regularly and is usually five or six feet thick. 



Batesville Sandstone. 

 In the isolated small hills norfhwest, southeast and south of West- 

 ville, sandstone beds twenty feet or more in thickness overlie the 

 Fayetteville shale, and are probably the equivalent of the Batesville 

 sandstone. This sandstone bed is apparently lacking at other places 

 over the field where the Fayetteville shale was seen.^ 



Boston Group. 

 This group is composed of the uppermost beds of the Lower Car- 

 boniferous and corresponds to the St. Louis and Chester horizons of 

 Illinois, etc. The classification of the group into beds as was 

 worked out in Washington county. Ark., by Dr. F. W. Simonds'^ is 



as follows : 



Kessler limestone. 

 Coal-bearing shale. 

 Pentremital limestone. 

 Washington shale and sandstone. 

 Archimedes limestone. 

 Marshall shale. 



These horizons were classified mainly on lithologic characters, 



1 Mr. Stuart Weller has recently shown that the Batesville sandstone is the 

 equivalent of the Aux Vases sandstone of Illinois and Missouri ( Trans. N. Y. 

 Acad. Sci., xvi, 251-282). 



2 Ann. Rept. Geol. Surv.y Ark., 1888, Vol. iv, p. xiii. 



Boston group 



