486 INDEX TO THE STEATIGKAPHY OF NOKTH AMERICA. 



Weeks in southeastern Idaho, the upper half of which contains the Lower Triassic faunas of 

 J. P. Smith. Personally I expect to find that the lower part of the Permian ( ?) strata in Weeks's 

 section is not separable paleontologically, as it is scarcely lithologically, from the upper part 

 all being Permian or Triassic, as the case may be. Walcott's Permian I believe to correlate 

 rather with the upper than the lower part of these strata. 



I-J 14. KANSAS AND OKLAHOMA. 



The strata assigned to the Permian of Kansas are thinly interbedded lime- 

 stone and shale of marine origin. They have been minutely distinguished and their 

 study is embarrassed by the number of names attached to thin beds, some of which 

 are but local members. Prosser ^^ gives the following tabulation and discusses the 

 nomenclature and correlation. 



Classification of the upper Paleozoic fovTnations of Kansas. 



Permian system (?) : 



Cimarron series [red beds]: 

 Kiger stage: 



Taloga formation. j-^ej „ 



Day Creek dolomite 1_5 



Red Bluff formation 175-200 



Salt Fork stage: 



Dog Creek formation: 



Chapman dolomite 



Amphitheatre dolomite 



Cave Creek formation: 



Shimer gypsum 



Jenkins clay 



Medicine Lodge gypsum 



Glass Mountain formation: 



Flower-pot shales 



Cedar Hills sandstone 



Kingfisher formation: 



Salt Plain member 



Harper sandstone 



Big Blue series: 

 ' Sumner stage; 



Wellington shales 200 



Marion formation 100 



Chase stage : 



Winfield formation 25 



Doyle shales 60 



Fort Riley limestone 40 



Florence flint 20 



Matfield shales 70 



Wreford limestone [*] 40 



Base of the Permian. 



Adams adopts the formation names used by Prosser in the foregoing classifica- 

 tion, from Wreford limestone to Wellington shale, both inclusive. 



The sequence of strata throughout the Pennsylvanian and Permian is an alter- 

 nation of limestones and shales without any marked interruption of stratigraphic 



"The thicknesses given up to and including the Wellington shale are from Adams; ' those of the higher forma- 

 tions from Cragin.'™>"* 



b Beede has recently traced the Wreford limestone into the McCann sandstone of Gould, yielding typical Texas 

 Permian vertebrates. — Note by S. W. Williston, June, 1909. 



1,000 



