‘ 
4 
34 On the Triassic Rocks of Kansas and Nebraska. } 
We have only to add in regard to the formation under con- 
sideration that we think it will no longer be doubted that it | 
really belongs where we have always placed it, in the Cretaceous — 
Seainia 4 
Between the base of No. 1 and the beds from which the’ 
_ * After the reception of a brief preliminary report by us, published last winter 
in the National Intelligencer, on the collections tebapht A ris the Black Hills 
ieut. Warr Marcou published a paper in } j 
nd H 
ese learned geologists admit not only the exis 
a {Permian nd Jurassic, but that they are 
to regard as Jurassic, formation No. 1, of their Nebraska Cretaceous Series, a forma 
tion which from their description, I have no hesitation in regarding as Jurassic,” 
Tt was Spey owing to the pcsey et A of our preliminary stat ent 
the J urassic and other discoveries in the Black Hills, seen ae Mr. Marcon in the 
telligencer, that he misunderstood us. We have no where said we had re 
e Trias in the northwest: nor have we itted in any our publicati 
with great pleasure I see that th 
San¢ (Per: 
* 
sim 
the Black Hills, and the absence of organic remains near the junction, we W 
doubt respecting t orizon at which the line shou drawn be 
them. _ At the same time, we stated that the beds from which the Jurassic foss 
pars by us were obtained, hold a position below No. 1, of the Nebr 
+ Amongst these we recognize nearly all the Carbonif. ue 
Marcou in his “ Geology of North pp Book erous fossils figured by 
