178 F. V. Hayden on the Cretaceous rocks of the West. 
“Tt is remarkable that the plants of Nebraska (as Magnolia and 
Liriodendron) present relations with the existing flora of Amer- 
ica, whilst the Cretaceous flora of Europe has more of an Indo- 
Australian character. It thus appears that since the Cretaceous 
epoch, the American flora has not undergone a change so great 
as the European flora. While the Cretaceous flora of Europe is 
entirely different from the existing European flora, that of Ne- 
braska contains 8 genera yet found in America, and it is the 
more remarkable that the greater part are yet found in a country 
under the same latitude.” 
Prof. Heer describes the following species of plants from this 
group in this memoir: Populus litigiosa, P.? Debeyana, Salia’ 
nervillosa, Betulites denticulata, Ficus primordialis, Platanus? New- 
ana, Proteoides grevilleeformis, P. daphnogenoides, P. acuta, 
Aristolochites dentata, Andromeda Parlatorii, Diospyrus primeva, 
issites insignis, Magnolia alternans, M. Capellini, Liriodendron 
—- Phyllites Vanone. 
oth Mr. Marcou and Prof. Capellini agree in regarding this» 
sandstone in which the dicotyledonous leaves are found as 4 
fresh-water formation. I would simply say that I have always 
s 
The question has arisen, whether this period had a fauna cor- 
responding to its flora? Besides the Mollusca already alluded 
to, no remains of land animals have yet been discovered whic 
could be positively identified. On the eastern slope of the Big 
Horn mountains, I saw in 1859, a series of beds holding a post 
tion between No. 2 Cretaceous and the Jurassic rocks below, 
or the transition beds which we have called Permo-carboniferous. 
These questions have been most ably and exhaustively discussed 
by Mr. F. B. Meek in an article in this Journal, Jan., 1866, © 
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