384 Adams — Carboniferous and Permian Age of the 



Wewoka. This made possible the correlation of the Kansas 

 section of the Carboniferous with the Indian Territory section 

 thus far worked out by Mr. Joseph A. Taff and the writer.* 

 It appears that there are in the Choctaw Nation 9,000 feet of 

 shales and sandstones above the lowest productive coal, which 

 are . lower than the Fort Scott limestone and its equivalent, 

 while in southeastern Kansas there are but 450 feet of shales 

 and sandstones between the Fort Scott limestone and the Missis- 

 sippian or Lower Carboniferous. It will be observed that the 

 line of outcrop of the limestone as above traced diagonals the 

 divisions of the Coal Measures as drawn by JSL F. Drakef and 

 the horizon extends into the area which he erroneously called 

 Permian. 



The results of tracing this horizon strengthened the writer's 

 conviction that similar work in the higher portion of the sec- 

 tion would determine the relation of the Red Beds to known 

 formations in Kansas, and in June a trip was made through 

 the Osage Nation into Oklahoma. The previous geological 

 work which had been done in this locality by Drake and by 

 Gould consisted of sections across the rocks and did not permit 

 of accurate correlations.^: The formation which was selected 

 to be traced is the limestone described in the writer's field 

 notes as the Elk Falls. § It occurs about 700 feet below the 

 base of the Permian as determined by Prosser. It was chosen 

 because, from its thickness and its relation to the adjacent for- 

 mations, it was believed that it would be found persistent for 

 a considerable distance southwestward. The line of its outcrop 

 was followed from near Hewins, Kansas, and it was found to 

 pass just west of Pawhuska, where it is the equivalent of the 

 Pawhuska limestone, named by J. P. Smith, || and mentioned 

 in the sections by Drake and Gould. In southern Kansas, 

 there are two heavy ledges of limestone separated by shales. 

 In the Osage Nation, although it has not been previously so 

 noted, there are three, all of which are persistent as far as the 

 Arkansas river, although considerably thinner southward. The 

 line of outcrop crosses the Arkansas river at Blackburn and 

 continues to Ingalls, where it is the same as the limestones 

 mentioned by Gould in his section made east of that place. 

 Southwest of Ingalls the limestone becomes thinner. Its strike 

 will carry it across the Cimarron river near Perkins. From 

 Ingalls the route followed by the writer was to Ripley and 

 thence to Chandler. In traveling southward, the shales and 



* Coalgate Folio, U. S. Geol. Survey. 



f Proc. Amer. Philos. Soc, vol. xxxvi, p. 326. 



\ This Journal, March, 1901, p. 185. 



§ Vide vol. iii, Kaus. Univ. Geol. Surv. 



I Jour. Geol, vol. ii, p. 199. 



