250 



Kansas Academy of Science. 



This section, with the article from which it was taken, was pub- 

 lished in the Proceedings of the Philadelphia Academy of Sciences, 

 1859, pp. 16, 17. 



It is by no means a simple matter to correlate Meek and Hayden's 

 section with our present knowledge of the section of this region. 

 No. 22 of their section is pretty certainly the Cottonwood limestone. 

 If this is the case. No. 18 would probably represent the Wreford 

 limestone, and 16 may be the "main ledge" of the Fort Riley lime- 

 stone. If this is true, then 15 would be the Doyle shales and 14 

 the Winfield limestone. This would make the upper part of the 

 section correspond in a rough way to the Marion-Herington sec- 

 tion which is to follow. The conglomerate No. 9 (Prosser's Abi- 

 lene conglomerate) probably represents the layer referred to that 

 name and horizon below occurring near Herington and Marion, 

 though there are some lithologic differences in its make-up. This 

 would leave 10 and 11 to represent the remainder of the rooks 

 to the Luta limestone, No. 12. The general condition of the 

 region, with sections, is given by Prosser.^ Owing to the possible 

 occurrence of low dome-like structures in the Permian rocks of this 

 region we cannot correlate the sections near Salina and the Grypsum 

 creek region with the eastern section until our detailed studies are 

 carried over it. 



In 1895 Prosser published the "Classification of the Upper 

 Palaeozoic Rocks of Central Kansas."^ In this paper he divided 

 the Permian rocks into "formations or stages." The formations of 

 the Chase stage are now familiar to those acquainted with the 

 stratigraphy of the region and will be omitted. The Marion was 

 subdivided as follows: 



Marion. 

 (Prosser). 



Chase. 



Variously colored shales and marls. 



Colored shales and marls alternating with beds of gypsum. 



BufF limestones and marls. 



Abilene conglomerate. 



Buff limestones which contain large Lamellibranchia. 



Grayish (?) limestones containing plenty of Baketvellias, 

 near this horizon in some localities a concretionary 

 limestone. 



Thin buff limestone with a few Derbyas. 



Univ. Geol. Surv. Kan.. II. pp. 56-64, 1897. 

 Jour. Geol., III. pp. 682-705, 764-800. 



