HOMOTAXIAL EQUIVALENTS OF THE PERMIAN 325 



development of the beds in question in Texas as compared with 

 those north of the Wichita range, and the meager information, 

 of an exact kind, regarding the former, make any attempt at 

 correlation little short of guesswork. However, White's fossils, 

 collected in the upper Wichita and lower Clear Fork, indicate an 

 horizon near the Plattsmouth beds of Nebraska. The Albany 

 seems to be very nearly equivalent to the Missourian series 

 below the horizon just mentioned. The Double Mountain beds 

 are, in a broad way, manifestly approximately equivalent to 

 Cragin's Cimarron series. This leaves a considerable part of the 

 Clear Fork beds representing the Chase and Marion of Kansas. 

 There are in Texas indications of an unconformity at the base of 

 the Clear Fork. Should this prove true, as now seems probable, 

 it amply accounts for a number of hitherto inexplicable phe- 

 nomena connected with the Kansas rocks, above the main lime- 

 stones of the Missourian. 



Organic remains. — It is unfortunate that, with all the advan- 

 tages that the various workers in the so-called Permian have 

 had, the information regarding the faunas is so meager. Fossils 

 are abundant, at least up to the middle of Prosser's Marion. 

 Such as have been recorded present some interesting phases. 



It cannot be gathered from the discussions concerning the 

 fossils found in the Upper Paleozoic west of the Missouri River, 

 in Kansas and Nebraska, just what should be considered the typ- 

 ical "Permian" fauna. The appearance of abundant lamelli- 

 branchs and the disappearance of brachiopods seem, as noted 

 elsewhere, to be the most notable features to which attention has 

 been called. Geinitz, considering the fossils found in the 

 Nebraska beds, which he referred to the Dyas, had before him 

 both types. These strata are now known to be partly imme- 

 diately below the Wabaunsee and partly the very base of the 

 latter. Geinitz did not misinterpret their position so badly as 

 Meek and others would have us believe. His comparisons were 

 made with European standards, and if such comparisons can 

 have any value at all they indicate a degree of acumen on the 

 part of the German paleontologist that few Americans credit him. 



