144 
The American Geologist. 
September, 1905 
given as the upper limit of the Missourian series and in de- 
fining the series it was stated that 
"In suggesting the name Oklahoman as a serial geological term 
it is intended to apply to all those rocks of Carboniferous age which 
occur north of the Canadian river in Oklahoma and which lie be- 
tween the interval of the top of the Missourian series and the base 
of the Cretaceous. It may be regarded as essentially covering the 
same succession of strata that has long been vaguely known under 
the title of 'Permian.' The name is derived from the territory in 
which the formation has its best development and in which the 
most complete sequence is represented. The best sections across 
the belt appear to be exhibited along the Cimarron, Arkansas and 
Kansas rivers, and these sections may be considered typical."* 
In October, 1901, Dr. Keyes accepted the name Cimar- 
ron series for the Red Bedst and gave the upper three series 
of the Carboniferous in ascending order as the Missourian, 
Oklahoman and Cimarron* stating their respective strati- 
graphic values as 4, 2 and i.§ 
The following month DV Keyes published a "General 
Geological Section of the Carboniferous of the Mississippi 
Valley," in which a complete list of the series and terranes 
of the system is given. For the portion under consideration 
it is as follows : 
Series. Terranes. 
Cimarron . 
{ 
Carboniferous 
system. 
[Upper 
portion] 
Oklahoman. 
Missourian 
[Upper part] 
Kiger shales. 
Salt Fork shales. 
Wellington shales. 
Marion limestone. 
Chase limestone. 
Neosho shales. 
Cottonwood limestone. 
Atchison shales. 
[Wabaunsee of Prosser]* 
It will be seen from the above quotation that the ter- 
ranes listed by Dr. Keyes as composing the Oklahoman 
series are entirely Kansas formations and precisely the same 
as those given by professor Cragin for the Big Blue series. 
It was this agreement which led the writer in his "Classifi- 
* Ibid., p. 27. 
f Am. Jour. Sci., 4th ser., vol. xii, p. 309. 
t Ibid,, pp. 306, 309. 
§ Ibid., p. 30G. 
'■■ Am. Geol. vol. xxviii, Nov., 1901, p. 302. 
