Keyes — The Guadalupan Series. 



125 



that part of the general section lying above the horizon 

 of the Cottonwood limestone. 



Later, after a long sojourn in southwestern United 

 States, I made the observation 5 that "after seeing at 

 close range the Red-beds of New Mexico I was convinced 

 that the Permian question in America was not to be set- 

 tled on the basis of Kansas stratigraphy." 



In tracing the Kansas Red-beds, or Cimarronian series, 

 southwestward around the southern end of the Rocky 

 mountains into central New Mexico the courses of the 

 Canadian river and the Rio Pecos were followed, the val- 

 leys of these streams cutting off to the north and west 

 the extension of the great plains of the Llano Estacado. 

 Upon stratigraphic grounds mainly I thought that I had 

 found the Cimarronian part of the Carbonic sequence 

 uninterrupted until a point was reached to the southwest- 

 ward where it rested directly upon the limestones form- 

 ing the backslope of the Guadalupe mountains, the locality 

 from which Shumard had received from his brother the 

 fossils which he described as true Permian in age. 



On comparing the general terranal sequences of the 

 two provinces mentioned we find that there are, in the 

 Mississippi section of the Carbonic strata, great thick- 

 nesses of rocks which are not represented. Paralleling 

 the serial divisions of the two sections: 



In Kansas the so-called Permian beds are included in 

 the Oklahoman and Cimarronian series, the latter being 

 the Red-Beds section. The relationships of the several 



5 Ibid. 32:218. 1903. 



