358 DKAKE — THE GEOLOGY OF INDIAN TERRITORY. [Sept. 3, 



FEET. 



Argillaceous sandstone, sandstone shale and arena- 

 ceous clay shale 20 



Limestone : the lower part is brownish weathering 

 and somewhat shaly, the upper part is massive 



and gray 20 



Sandstone 5 



Limestone 5 



Sandstone 5 



Limestone containing Archimedes in the central 

 part of the bed 50 



Fayetteville shale and some interstratified blue 

 limestone at base 



West and northwest of Tahlequah, along Pecan creek and Four- 

 teen Mile creek, and along Grand river, east and northeast of 

 Wagoner, the Boston group is usually limited to a fifty to seventy- 

 five foot bed of limestone, which is in places slightly interstratified 

 with clay and contains Archimedes and Pentremites associated 

 throughout almost the entire bed. The Archimedes, however, 

 are more common in the central and lower divisions, while 

 the Pentremites are more common in the central part of the bed. 

 Farther to the north it becomes thinner and more argillaceous 

 until calcareous and arenaceous clays form the principal part of the 

 group as shown in Sees, j and k, PI. V. East of Pryor creek, 

 Adair, Big Cabin, and south of Vinita, the group is represented by 

 yellowish calcareous clays, friable arenaceous limestones, some hard 

 gray limestone and a little sandstone. The limestone and clays are 

 usually rich in fossils. The following section (Sec. k, PL V) will 

 show the general character of the group along its outcrops from the 

 Grand river, east of Chouteau, to within one and a half miles of 

 Vinita. 



FEET. 



Brownish weathering massive sandstone (Coal 



Measures ?) 5 



Clay shale (Coal Measures ?) 10 



Sandstone (Coal Measures ?) 12 



Coal Measures 27 



