134 



KANSAS UNIVERSITY SCIENCE BULLETIN. 



the knowledge of the Oklahoma deposits at that tirae.^ 

 table follows : 



The 



Cragin's classification. 



Big Basin sandstone. 



Hackberry shales. 



Day Creek dolomite. 

 Red Bluff sandstones. 

 Dog Creek shales. 



Cave Creek gypsums. 



Flower-pot shales, upper part. 



Flower-pot shales, lower part. 

 Cedar Hill sandstones. 

 Salt Plain measures. 

 Harper sandstones. 



Classification used in this report. 



Quarter- 

 master 

 Division. 



Delphi dolomite. 

 Collingsworth gypsum. 

 Greer J Cedartop gypsum. 

 Division, i Haystack gypsum. 

 Kiser gypsum. 

 Chaney gypsum. 



Woodward / g^J 2^%^ dolomite. 

 T-v-,,,^,_., < Ked Bluff sandstones. 

 DIVISION. I j3^g (.j,ggj^ shales. 



Blaine 

 Division. 



Norman 

 Division. 



' Shimer gypsums. 



Altoona dolomite. 



Medicine Lodge gypsum. 



Magpie dolomite. 

 . Ferguson gypsum. 



"The term 'division' is here used in a general sense, cor- 

 responding with its ordinary English meaning, to designate 

 a larger or smaller sequence of strata which may in one in- 

 stance correspond to a formation having a simple and uniform 

 lithologic character, or in another to a group of such forma- 

 tions." 



In discussing the Norman division, which is not differ- 

 entiated in the section, he states that "the rocks of the Nor- 

 man division consist chiefly of brick-red clay shales, with 

 some interbedded ledges of red and white sandstone. In the 

 eastern part of its visible extent sandstone predominates, 

 while in the region along the base of the Gypsum Hills the 

 beds consist almost wholly of clay. 



"The Norman division may be divided on lithological 

 grounds into three general districts, as follows : An eastern 

 district, in which the sandstones are of sufficient thickness to 

 form prominent ledges ; a central district, in which the sand- 

 stones are thinner and consequently less conspicuous ; and a 

 western district, in which the sandstones are practically 

 wanting. It is impossible, in the present state of our knowl- 



36. Loc. cit., p. 42. 



