128 KANSAS UNIVERSITY SCIENCE BULLETIN. 



destitute of fossils of any kind. Other limestone beds in the 

 Albany division when traced northeastward would gradually 

 pass into sandstone, while others would entirely disappear," 



He then discusses in detail the gradual changes in litho- 

 logical characters and the corresponding changes in the fauna, 

 and states that by "thus tracing the escarpment between the 

 two points, the Clear Fork of the Brazos river and the Big 

 Wichita river, and finding it continuous, we demonstrated 

 very clearly that the beds called the upper part of the Albany 

 division in the previous reports are the same as those called 

 the upper part of the Wichita division in the same reports." 



After making these discoveries he includes the Albany di- 

 vision in the Wichita, calling it all Wichita, as they are 

 synchronous. He closes the paper by correlating the basal 

 Permian of Kansas and Texas in this manner : "The Phaco- 

 ceras dumblei Hyatt has been found only along a very narrow 

 horizon in the Texas Permian. That horizon was traced and 

 the fossils found for a distance of seventy-five miles. The 

 fossil was found quite numerous at places, so that it might 

 be said that the bed was characterized by that fossil. This 

 fact will assist materially in correlating the Texas and Kan- 

 sas beds, as that fossil has been reported only from one lo- 

 cality in the Kansas area, where it is associated with the 

 same fossils as in Texas. It is quite certain that the Fort 

 Riley horizon is the same as the Wichita division in Texas, 

 and is at the very top of the division. . , ." 



In 1892 Dumble and Cummins visited the Double moun- 

 tains and made a careful section of the rocks there, which 

 may, perhaps, be taken as typical of the summit of the south- 

 ern Red Beds and their relation to the Triassic. The Double 

 Mountain section is as follows :"^ 



Feet. 



J ( 1. Caprina limestone 40 



rrPtaoPons 2. Comanche Peak series 55 



cretaceous. ^ 3 trinity 25 



Trias 3a. Dockum 35 



4. Shaly clay, underlaid by red or terra-cotta sandstone, 105 



5. Upper gypsum beds 60 



6. Middle gypsum beds 75 



7. Lower gypsum beds 135 



Permian 



Concerning the relation of the Dockum beds of the Triassic 



23. Dumble and Cummins, Amer. Geol., IX, pp. 317-351, June, 1892. 



