710 CHARLES S. PR OS SET? 



On the chart showing the partial distribution of the Carbonif- 

 erous, the Chase is apparently given as corresponding to the 

 lower part of the Arta stage, which, according to his classifica- 

 tion, is the oldest stage of the Permian, and the Neosho is 

 represented as about on the dividing line between the Permian 

 and Upper Carboniferous, although perhaps it is intended to 

 include all of it in the latter division. 1 It is stated, however, 

 that the older Chase and Neosho strata (as compared with the 

 Marion) beyond doubt can only correspond to the Artinsk stage 

 (which is the oldest Permian of Russia = Arta stage), and that a 

 sharper division is made impossible by the absence of Cephalo- 

 pods. 2 It is to be noted that in the latter part of this work 

 devoted to "Die Dyas," in the table of Kansas Dyassic forma- 

 tions, Dr. Freeh has left the Neosho as the oldest division of the 

 Palaeo-Dyas. In this case, however, he was reporting the 

 classification of Professor Cragin, for it is stated that in the 

 following table the Kansas strata are enumerated according to a 

 recent survey, and it is not thought that he intended to set aside 

 his earlier correlation. 3 



In reference to the correlation of these divisions the writer has 

 stated that "The appearance and the prominence of the Pseudo- 

 mo?iotis fauna in the Neosho formation furnishes a strong reason 

 on the biologic side" for its correlation with the Permian. 4 The 

 presence of Psendomonotis is no longer an important argument in 

 favor of putting the Neosho in the Permian, because since then 

 Dr. Beede has identified Pseudomo?iotis Hawni, and described a new 

 variety of that species and two new species from the older forma- 

 tions of the Upper Coal-measures of Kansas. 5 



There is a marked lithologic change at the base of the Chase 

 stage where it begins with the Wreford limestone, which is the 

 lowest one of the very cherty massive limestones. It is perhaps 



1 Ibid., "Tab. XXIV, Einige wichtige Vorkommen des Carbon." 



*Ibid., p. 377, f. n. : " Dass die tieferen Chase -und Neosho-Schichten nur der 

 Artinskischen Stufe entsprechen konnen, steht ausser Zweifel ; jedoch wird eine 

 scharfere Abgrenzung durch das Fehlen der Cephalopoden unmoglich gemacht." 



3 Ibid., 3 Lief., 1901, p. 514. 4 Jour. Geol., Vol. Ill, 1895, p. 796. 



s Kan. Univ. Quart., Vol. VIII, April, 1899, Ser. A., pp. 79-84 ; and Univ. Geol. 

 Surv., Vol. VI, 1900, pp. 132-35. 



