148 The American Geologist. September, 190& 
The second paragraph of this division of the paper 
treating of the classification of this part of the rocks is as 
foil* >\vs : 
"The uppermost division of the Paleozoic of the region, the 
part widely designated as the 'Red Beds,' has received the title of 
Cimarron series. It appears to form a tolerably compact sequence, 
though there is still some dispute as to its exact geological age. 
Between the Cimarron series and the Missourian series are two 
other terranes that are well defined. One is composed of the Chase 
and Marion of Prosser, in part, and the other of the Wabaunsee, Cot- 
tonwood, and Neosho."* 
It will be seen from the above quotations that it is not 
definitely stated that the Wellington shales are put in the 
Cimarron series. Again, the name Oklahoman series does 
not appear in the paper; the top of the Missourian series 
is drawn from 500 to 550 feet lower than in his former 
papers and the rocks between the Missourian, as there lim- 
ited, and Cimarron series are divided into two series which 
are not named and clearly neither one nor both together 
agreed with the Oklahoman series as previously defined. 
The writer attempted to represent the views of Dr. Keyes 
fairly and, if he failed, it appears to him that it was partly 
due to the lack of clearness in the statements made by Dr. 
Keyes. 
The writer, however, objects to the last paragraph of 
Dr. Keyes' paper which is not a fair statement. It is as fol- 
lows : 
"A singular argument does professor Prosser use to retain the 
title of Permian as the name of a system and period. He refers to 
half a dozen Russian writers who have used the title in this sense. 
No allusion whatever is made to a much larger number of Russian 
geologists who are equally distinguished and who all have worked 
extensively in the typical regions, but who hold very different 
views. This method of presentation is hardly the scientific 
method."* 
As a matter of fact the writer took the later official re- 
ports of the Russian survey 1 ' so far as he was able to obtain 
them, and gave a very condensed but impartial statement 
regarding the classification of the rocks under consideration. 
* Loc. cit,. p. 339. 
* Am. Geol., vol. xxxii, p. 223. 
t In obtaining references to various articles in the Memoires du 
Comite geologique de Saint- Petersboitrg describing the upper Paleozoic 
the writer availi d himself of the copious foot notes in volume ii of Suess' 
"La face de la terre," Margerie's translation, l!)0O. and references in 
Freeh's "Lethsea palaeozoica." 
