198 



THE DEVONIAN AND CARBONIFEROUS. 



[BULL. 80. 



in the country east of the sixth principal meridian and between the 

 northern boundary of Kansas and the Republican Fork of the Kansas 

 River. In this section the lowest bed, m, a siliceous limestone, is re- 

 garded as Carboniferous. The strata c to I, next above, are considered 

 as equivalent to No. 1 of the Nebraska section. The lower part of these 

 beds,/ to Z, is correlated with the Triassic of Marcou; the higher part 

 a to e, with Marcou's Jurassic. The Pyramid section of New Mexico, 

 according to Mr. Marcou, is given, p. 132. The lower members of this 

 section, c, d 7 and e 7 called Jurassic by Marcou, and /, called Triassic by 

 him, are correlated with No. 1 of the Nebraska section. 1 



In a second paper by F. V. Hayden, 2 a strip of Permian is colored in 

 Kansas between the Carboniferous and the Cretaceous, a little west of 

 Nebraska City and west of Fort Riley, in what in the first map was col- 

 ored Cretaceous. This change is based upon facts reported by Hawn. 3 



It appears from this paper that the insertion of No. 1 of the Nebraska 

 section of the Cretaceous was made upon the report of Hawn as to the 

 species contained in it or below it, which belonged to genera character- 

 istic of the Cretaceous. 4 Upon examination of fossils derived from No. 

 1 they were found by Meek to be of Permian or Carboniferous types. 

 The presence of the leaves of dicotyledonous trees was the evidence 

 upon which the authors (Meek and ITayden) relied as positive indication 

 of the Cretaceous system. These occurred above No. 1. The evidence 

 for this correction apparently did not reach the authors in time to adjust 

 the body of the paper. 



Meek and Hayden. 

 Nebraska section. 



Hawn. 

 N. E. Kansas. 



Marcou. 



Pyramid Mountain, 



New Mexico. 



Winch ell. 

 Alabama. 



Cook. 

 New Jersey. 



Tertiary Miocene. 







A 

 B. C. D. 



a 

 c. d. e. 



f 



No. 4.. 

 No. 3.. 

 No. 2.. 



Permian or Car- 

 boniferous No. 1. 



Carboniferous 



a 

 lb 





' Jur. 

 rrias. 



c-l 



c 

 d 



e 

 f 



E 



m 





In the Judith Kiver section a bed called " No. 1 (?) is defined, and 

 its true position was uncertain to F. V. Hayden in May, 1857. 5 

 B. F. Shumard, in a paper 6 read before the Academy of Science, in 



1 Description of new species and genera of fossils collected by Dr. F. V. ITayden in Nebraska Terri- 

 tory, under the direction of Lieut. G. K. Warren, U. S. Topographical Engineer ; with some remarks on 

 the Tertiary and Cretaceous formations of the Northwest, and the parallelism of the latter with those 

 of other portions of the United States and Territories, by F. B. Meek and F. V. Hayden, M. D., Proc. 

 Acad. Nat. Sci., Phila., vol. 9, p. 129. 



2 Proc. Acad. Nat. Sci. Phil., vol. 10, pp. 139-158. 3 See note, Ibid., p. 144. 

 4 See note, Ibid., p. 145, 146, foot-note. 5 Ibid., vol, 9. p. 116. 



e " Observations upon the Cretaceous strata of Texas, " by B. F. Shumard, State Geologist, Trans., 

 vol. 1, No. 4, p. 582. 



