556 L. Lesquereux—Lignitic formations of the Rocky Mountains. 
2. The Evanston coal is, by its types, half Eocene, half Mio- 
cene, referred as yet to the Upper Kocene. 
3. The flora of Carbon is positively Middle Miocene. 
4. That of Green River, Elko Station and the Parks is of 
Upper Miocene type. 
Having thus fairly considered and answered all the critical 
observations of Dr. Newberry, I will end the discussion 
passing over to his ground and proposing a single question 
which I should like him to answer. 
He positively regards the New Mexico Lignitic as Cretaceous. 
From his admission, the Colorado Lignitic is of the same 
formation; for, though he says that he has not seen it, he is 
positive that a number of geologists have found there Cretace- 
ous animal fossils. As the Wyoming Black Butte coal has the 
Deinosaurus imbedded in its roof shale, this bed, like the under- 
lying Lignitic, is also Cretaceous. It is therefore a single undi- 
vidable formation. Now, we find at Black Butte, together with 
a great abundance of Sabal leaves, a number of the species de- 
scribed by Dr. Newberry in his Ancient Floras ; Cornus aewmt- 
nata* is especially abundant there. With this we have too the 
facoidal remains and, more numerous than any other species, the 
Halymenites. At Golden, we have a still larger preponderance 
of Sabal and of Fucoids too, and preponderance of Platanus 
It will not do to say that a Cretaceous Lignitie flora may 
have some Miocene species and be Cretaceous all the same, 
especially wh recognized in| 7% 
After all the points of comparison and the facts mentioned ip 
these remarks, after the assertion of Dr. Newberry that the 
palm leaves are evidently Miocene and the Halimenites as evi- 
* A species far different from Cornus acuminata Web, 
