66 C. W. Honess — Stanley Shale of OMahoma. 



"Unconformity (?) Feet. 



Ordovician : 



Polk Creek shale 0-200 



Bigfork chert 700 



Womble shale 250-1,000 



Blakely sandstone 0-500 



Unconformity ( ? ) 



Mazarn shale 1,000 



Ordovician (?) 



Crystal Mountain sandstone 850 



Unconformity. 



Cambrian : 



Collier shale (observed thickness) 200 



A great many notes and other data have been secured 

 bearing on the general geology of this whole section as 

 exposed in Oklahoma but only the Stanley formation will 

 be described here. The report, complete with photo- 

 graphs, maps and sections, will appear in due time as a 

 bulletin of the Oklahoma Geological Survey. In the 

 meantime my thanks are due to Dr. C. W. Shannon, Direc- 

 tor of the State Survey, who made it possible for me to 

 carry out these researches. I wish also to acknowledge 

 my indebtedness to Dr. Charles Schuchert, who has crit- 

 ically read and corrected this manuscript. 



The Stanley Shale. 



The Stanley shale is exposed throughout the full extent 

 of the Massern Ranges from Atoka, Oklahoma, to Little 

 Rock, Arkansas, covering in all many hundreds of square 

 miles of territory. That portion of the formation under 

 discussion, which comes to the surface in the Lukfata 

 Quadrangle on the flanks of the great anticlinorium has 

 been studied with considerable care as have also certain 

 areas adjacent to the north and to the west. A cursory 

 examination was made of the sediments in the vicinity of 

 Redden and east (northeast of Atoka in the Atoka Quad- 

 rangle) and a hurried trip made through the Kiamichi 

 River valley (in the Antlers Quadrangle) but of the ex- 

 posures in Arkansas the writer has seen only those occur- 

 ring near the Oklahoma-Arkansas line — a strip about 10 

 miles wide. In the descriptions which follow, therefore, 

 it should be understood that it is the region of the Lukfata 

 Quadrangle in particular and the areas immediately ad- 

 jacent to the north and west, a few miles in each case, to 

 which the writer refers. His statements in no case are 

 drawn from or concern any other area. 



