202 THE DEVONIAN AND CARBONIFEROUS. [bull. 80. 



viciuity. He regarded the section TT as representing in America "la 



c . 



JL 



A 



partie sup£rieure du Dyas d'Europe." 1 Of the section of the bluff at 

 Plattesmouth he said: "elles appartiennent a la partie inferieure du 

 Dyas." 2 



In Missouri he reported islands of Carboniferous in the midst of the 

 Dyas. Two members of the Dyas were recognized, viz, the Rothlie- 

 gende and the Zechstein. 



In regard to Brachiopods as a means of correlation, he remarked : 



Les plus niauvais fossiles dont on puisse ae servir comme fossiles charactdristiques 

 des formations, et qu'eii re'alitd ils ne sont memo pas du tout des Leitmuscliel * * * 

 plus bas ni6nie dans la serie que les coraux. 3 



Had he api)reciated better the value of Brachiopods in making cor- 

 relations his conclusions might have been more accordant with those 

 of other geologists. 



This paper of Mr. Marcou was criticised in 1865 by Mr. Meek, 4 who 

 took issue with him upon almost every point made. Although the dis- 

 cussion was of interest at the time, its rehearsal here may be omitted 

 without loss. 



In 18G6 Mr. H. B. Geinitz published his description of the fossils col- 

 lected by Mr. Marcou from the localities in Kansas and Nebraska named 

 in the paper above referred to. 6 



There are mentioned in the work 99 species, 2 of them plants. Of 

 these, 07 were found at the typical Nebraska City section, the zones of 

 which were called, from below upward, A, B, 0, D, by Marcou. Sixty- 

 three of the G7 species were from the zone 0. Twenty-three species of. 

 invertebrates and one plant from the Nebraska City section were 

 identified with already described " Dyas" species of Europe. The 

 author says: "Die bei Nebraska-City vorkommenden Versteinerungen 

 gehbren einer Zone an, welche den untersten bis mittleren Schichten 

 den deutschen Zechsteinformation (Oberen Dyas) entspricht." 6 



The Plattesmouth and Kock Bluff sections were thought to represent 

 a lower horizon, the "Fusulinenkalk" or " oberen Kohlenkalk." 



The bulk of the work, pages 1 to 72, is devoted to the description of 

 the fossils and their comparison with typical species of the Carboniferous 

 and Permian formations. Although the correlations of the author 

 were based upon this paleontological study, it is impracticable here 

 to discuss the merits of the identifications of species. 



In the following year (1867) Mr. Meek made an extended review of 



'Marcou, Jules: Une reconnaissance geologique au Nebraska. Soc. geol. France, Bull., 2<" ser., vol- 

 21, 1884, p. 137. 



•Ibid., p. 138. , a Ibid., p. 146. 



4 Meek, F. B. : Remarks on tbe Carboniferous and Cretaceous rocks of eastern Kansas and Nebraska, 

 and their relations to those of the adjacent States and other localities further eastward ; in connection 

 with a review of a paper recently published on this subject by M. Jules Marcou, in the Bulletin of 

 the Geological Society of France. Am. Jour. Sci., vol. 39, 1865, pp. 157-174. 



6 Carbonformation mid Dyas in Nebraska, von Dr. H. B. Geinitz, 1866, pp. i-xii and 1-91, Plates I-V. 



6 Op. Cit.,p. 89. 



