UPPER PALEOZOIC FORMATIONS OF KANSAS 7 1 9 

 CORRELATION OF THE CIMARRON SERIES. 



In the earlier papers of the writer, the Cimarron series was 

 referred provisionally to the Permian 1 ; but later the discovery 

 of Permian fossils as high as the Red Bluff formation, together 

 with other data, apparently proves that at least the greater part 

 of the series is of Permian age. Most of the fossils have been 

 found by Professors A. H. Van Vleet and Charles N. Gould ; 

 the latter has described the horizons from which they were col- 

 lected and given a list of three specific and three generic identi- 

 fications of Permian vertebrates by Dr. Williston, which came 

 from near the base of the Harper sandstone, and eleven genera 

 of invertebrates identified by Dr. J. W. Beede. He states that 

 the highest locality, which is in the Red Bluff formation, " has 

 yielded some twenty species of invertebrates, several of which 

 are of new forms." 2 



Dr. Beede, who has also published a note concerning these 

 highest fossils, states that "they are mainly pelecypods with a 

 species of brachiopod and a few gasteropods. . . . Aviculopecten 

 occideutalis (Shum) Meek, is also present, and one other species 

 bearing somewhat of a resemblance to it, but quite different 

 from it in some respects, is also present. One of the common 

 fossils is a biplicate terebratuloid, Dielasma Schucherti Beede, 

 belonging to a group of this genus heretofore unknown in the 

 American Permian. Mr. Schuchert informs me that it is very 

 similar to a species of this genus described by Waagen from the 

 Permian of Europe 



The presence of these fossils clearly demonstrates the Per- 

 mian age of these rocks, coming as they do from very near to 

 the top of the beds." 3 The description of these invertebrate 

 fossils from the Red Beds by Dr. Beede has been published as 

 an Advance Bulletin of the First Biennial Report of the Okla- 

 homa Geological Survey. 4 The following new species are 



1 Univ. Geol. Surv. Kansas, Vol. II, 1897, pp. 89-92 ; Kan. Univ. Quart., Vol. 

 VI, 1897, pp. 150, 151 ; Jour. Geol., Vol. VII, 1899, pp. 354-6. 



2 Jour. Geol., Vol. IX, July, i90i,p. 339. 



3 Am. Geol., Vol. XXVIII, July, I90l,pp. 46, 47. 



4 April, 1902, pp. I— 11, with one plate. 



