90 Kansas Academy of Science. 



and finally, where the limestone displaces it, gradually becoming 

 thinner and thinner; streaks of shale divide it into dilBPerent layers, 

 and finally the shale replaces it entirely, the streaks of limestone 

 becoming merely little, thin layers of shells, the shells being per- 

 fectly preserved in the shale. 



If the Neva limestones and the one at the top of the Florena 

 shales be considered as part of the Cottonv^^ood limestone forma- 

 tion, then this limestone continues, south of Hooser into Okla- 

 homa, in the limestone described as Neva in this paper. 



