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176 =F. V. Hayden on the Cretaceous rocks of the West. 
8. “The dyas of Nebraska is composed of two members, as in 
Russia and Germany, one of which corresponds to the Rothlie- 
gende and the other to the Zechstein.” 
Prof. Capellini in a short but very interesting article confines 
his observations mostly to the rocks of the Dakota group and 
remarks that he does not hesitate to regard the observations of 
American geologists as entirely just. The following remark 
close the article of Prof. C. 
“After all we have observed in relation to the environs of 
Sioux City, it is easily seen that a stratigraphic series so com- 
ioe throws a clear light upon the isolated facts first noticed at 
ekamah and Blackbird Hill, and indicates the exact position of 
the rocks with dicotyledonous leaves, analogous to the Tertiary 
leaves of Europe but belonging in reality to the Chalk. 
“Tt may be estimated that the thickness of these Cretaceous 
strata in the environs of Sioux City is about 40’ meters. They 
may be divided into two distinet parts, one rich in leaves, 4 
fresh-water formation; the other truly chalky with fishes and 
Inoceramus, of marine origin—both are probably not older 
than the chalk of Maestricht. This has been my opinion from 
the time I admitted that the dicotyledonous leaves of the Big 
Sioux and Tekamah were Cretaceous. 
“Once the age of the Mollasse with leaves established by the 
aid of the stratigraphy and the animal fossils, it would be inter- 
esting if it were possible to arrive at the same results by the 
was especially the first locality which furnished the best specl- 
mens. We are convinced that when observations are exact and 
determinations made from careful examination of specimens, 
ere is never an y disagreement between stratigraphical and 
with the Phyllites which I have referred to the genera Platanus 
and Andromeda. It is certain that all the leaves found by Mr. 
two to Populus and two to Magnolia, although there are nO a 
companying fruits or other parts te confirm these determin* 
