136 KANSAS UNIVERSITY QUARTERLY. 



pearance of having come from such sandstone, which is, perhaps, 

 more largely developed in the Arilla hill than anywhere in Kiowa 

 county. The Kiowa lenses are usually rather hard and highly fer- 

 ruginous, like the material in which these casts are preserved. "^ 

 In the western part of Clark county is a yellowish to grayish- 

 white sandstone, named by Prof. Cragin the Big Basin sand- 

 stone, ^ and referred to him to the top of the Cimarron series. 

 From the writer's studies in the Big Basin region he was inclined 

 to consider it as representing the Cheyenne sandstone,'' but sec- 

 tions described by Prof. Cragin and Mr. Gould seem to show that 

 the former correlation is the correct one. Prof. Cragin writes 

 "that there are on Two-mile, a west side branch of Big Sandy 

 creek, Red-beds higher than the bed referred to as Big Basin sand- 

 stone in my article 'Observations on the Cimarron series','* and 

 that there are in central Oklahoma beds which seem to be consid- 

 erably higher yet. "^ The correlation of this sandstone with the 

 Red-beds is accepted by Prof. Ward, who regards it as their 

 "upper indurated portion."" 



1 Letter of December 15, 1897. 



2 Colorado College Studies, vol. vi. p. 46. 



3 Univ. Geol. Sur. of Kan.. i?ol ii, p. 172. 

 i Am. Geol., vol. xlx, pp. ;351-3()li. 



5 Letter of .June (i. ISW. 



G Science, N. S., vol, vi. p. 815. 



