Geological Papers. 253 



Feet. Inches. 



3. Maroon shales 13 



2. Limestone in thicker and thinner layers, some flaggy, cellular, 

 geodiferous, and containing some bands of chert concre- 

 tions 30 



1. Winfield limestone (?) top layer, full of fine chert concretions 



(only upper part of layer shown) 4 



In this section No. 2 is the Luta limestone. Nos. 3 to 6 are the 

 Enterprise shales, and No. 7 is the base of the Herington lime- 

 stone. 



Enterprise shales. — Over the Luta limestone are the Enterprise 

 shales, shown in position about the town of Enterprise. The ex- 

 posure in the section just given is the only one that I have seen 

 showing the whole thickness in the central part of the state. They 

 have been noted as far south as the vicinity of Uncas, in Kay 

 county, Oklahoma, and are remarkably persistent and constant in 

 their thickness. As will be seen from the section at the McCarty 

 place, thin limestones occasionally come in near the top. These 

 shales reach their maximum thickness, so far as now known, at 

 Arkansas City, where there are forty-four feet of them.^ 



Herington limestone. — Though not very thick, the limestone is 

 very extensive south of the Kansas river. It forms the elevations 

 in the eastern and western parts of Herington. It is quarried 

 northeast, west and southwest of Marion and at other places. It is 

 known to occur at Enterprise, Herington, Marion, and without 

 doubt is continuous with the limestone occupying the same horizon 

 from west of Winfield through Arkansas City to Kay and Noble 

 counties, Oklahoma. Its texture varies somewhat from place to 

 place, even within very limited areas. In the bottoms of small 

 valleys certain soft, geodiferous flaggy layers are sometimes found 

 which are usually eroded away on escarpments, the softer material 

 apparently resting upon the more resistant. The persistent layers 

 •are harder, of more of a bufif shade, more massive, and very fossil- 

 if erous. Sometimes these fossils are very small species of pelecypods 

 and occasionally they are rather large, perhaps occupying separate 

 layers. This limestone, in all probability, is exposed in the top of 

 the bluff north of Arkansas City (foot-note, a/i^e), where it is about 

 fifteen feet thick. It was correctly referred to the Marion by Pros- 

 ser.^ As we proceed southward the texture of this rock becomes 

 •coarser. This is especially noticeable in its exposure two or three 



5. Stratigraphy of the Eastern Outcrop of the Kansas Permian, Amer. Geol. XXXVI, p. 

 108, 1905. 



6. K. U. Quart. VI, pp. 173-175, 1897. Doubt of this reference was expressed by Beede in the 

 paper on "Stratigraphy of the Eastern Outcrop of the Kansas Permian," mentioned previously. 

 •The correctness of Prosser's reference was verified by Mr. Hooper under my direction. 



