198 G. I. ADAMS — RED BEDS OF NORTHERN TEXAS 



paleoflora to each other, and it is hoped that detailed work which will 

 establish a type section and obtain data concerning the horizons of the 

 fossils will be carried on the coming season. The writer does not attempt 

 to express an opinion in regard to the validit}^ of the Cisco, Alban3%and 

 other divisions of the section, but has accepted them as described by 

 Drake in his detailed mapping of the southern part of the field.* 



Obsolete Terms 



Concerning the divisions of the Wichita, Clearfork, and Double moun- 

 tain, it may be said that there is little reason to believe that they should 

 be an}^ longer retained, since the}^ have no stratigraphic significance. 



Relationships of Red Beds of Texas, Oklahoma, Indian Territory, 



AND Kansas 



The relation of the Red Beds in Texas, Oklahoma, Indian Territory, 

 and Kansas is more fully shown on the accompanying map (figure 3), 

 on which the lithologic divisions of the Coal Measures and Permian are 

 outlined. No names are proposed for the lithologic divisions there set 

 forth, it being the intention of the writer to await critical paleontologic 

 studies, in order that the faunal and floral changes may be given due 

 weight in establishing the divisions of the various sections. 



Carboniferous and Permian and their Relations 



. The lowest Coal Measure beds in Arkansas rest on the Lower Carbon- 

 iferous, and their contact, as exposed northward through Indian ter- 

 ritory, southeastern Kansas, and into Missouri, is apparently one of 

 overlap. In southeastern Indian territory the Coal Measure rocks are 

 limited for a considerable distance by a great thrust fault which brings 

 them in contact with the Ordovician. They overlap and rest uncon- 

 formably on the older Paleozoics, which form the periphery of the 

 Arbuckle mountains. In this region the Coal Measure sediments are 

 largely of local origin. From the Arbuckle mountains southward into 

 Texas the eastern limit is the contact with the overlapping Lower Cre- 

 taceous formations. In central Texas they rest for a short distance on 

 the Lower Carboniferous, and thence westward are overlapped by the 

 Lower Cretaceous. The western border of the Permian in Texas and 

 northward to the border of Kansas is the line of contact with the over- 



* Report on Colorado coal field. Fourth Ann. Rapt. Texas Survey, 1892, pp. 358-481. 



