wiluams.] MEEK AND HAYDEN, NORWOOD. 201 



Pyramid Mountain section (New Mexico), referred by him to the Trias. 

 These 200 feet the authors consider equivalent to the Kansas deposits 

 between the base of No. 1 aud the beds containing Permian fossils, 

 and the rest of the Pyramid section, which he referred to the Jurassic, 

 as equivalent to the Cretaceous formations, Nos. 1, 2, 3, of Nebraska. 



The authors refer to their having considered No. 1 as a Cretaceous 

 formation from the presence in it of dichotyledonous leaves (Ettingshaus- 

 iana, etc.), while Major Hawn pronounces this formation in Nebraska, 

 Kansas, and New Mexico, to be Trias, and they give Newberry's opin- 

 ion after having seen the whole collection, affirming the correlation 

 with the Cretaceous formations. They also speak of the beds between 

 the base of No. 1 and those from which Permian fossils are obtained 

 in Kansas, as possibly Jurassic or Triassic, or both, but do not attempt 

 to define their age with certainty. With regard to the Permian rocks 

 of Kansas, as classified by Swallow and Hawn, they are inclined to the 

 opinion that the lower Permian of these gentlemen should be consid- 

 ered as intermediate in age between the Permian and Upper Coal Meas- 

 ures of the Old World, while the Upper Permian only, of their section, 

 really represents the Permian rocks of Europe, and they propose the 

 name of U Permo-Carboniferous " for this intermediate series, but if 

 this be not adopted, think it should be placed with the Carboniferous 

 rather than with the Permian. 



In conclusion, they state that there is no unconfor inability among 

 all the rocks of Nebraska and northeastern Kansas, from the Coal 

 Measures to the top of the most recent Cretaceous. 



Mr. J. C. Norwood, 1 writing to B. F. Shumard, President of the St. 

 Louis Academy of Science, March 31, 1858, spoke of having found in 

 1855-'56 organisms new to him in the upper beds of the La Salle coal 

 field, which he supposed to belong to the true Carboniferous era. But 

 after the announcement of the existence of Permian rocks in Kansas 

 by Professor Swallow and Messrs. Meek and Hayden, he reviewed 

 some of these fossils found in Bureau, La Salle, and Henry Counties, 

 and became satisfied that the upper beds, at least, of tjie La Salle rocks 

 are of the same age as those considered Permian in Kansas. The beds 

 are composed of sandstones, conglomerates, magnesian limestones, 

 slates, aud red and blue gypseous marls, all of them resting unconform- 

 ably on the underlying beds. Thin seams of coal also occur, showing 

 that if this formation belongs to the Permian period, the great proba- 

 bility is that the upper beds of coal in several sections of the State are 

 of the same age. A section of the rocks at La Salle accompanies the 

 letter. 



In 1864 M. Jules Marcou 2 wrote upon the section at Nebraska City and 



•Norwood, J. C. : Discovery of Permian rocks at La Salle, Illinois. St. Louis Acad. Sci., Trans., 

 vol. 1, 1860, p. 115. 



■ Marcou, Jules : Uno reconnaissance geoloftique au Nebraska. Soc. g6ol. France, Ball., 2 P ser., vol. 

 21, 1864, pp. 132-14C. 



