40 FLORA OF THE MONTANA FORMATION. 
this time were often poorly labeled, and without a particular specimen 
in hand it is hazardous to assign it to a definite locality or horizon. 
A single example from Bridge Greek, Oregon, was referred to Quereus 
acrodon by Lesquereux, but this reference is undoubtedly incorrect, it 
being a species well known from those beds, viz, a sharp-toothed form 
of Q. pseudo-alnus. 
The locality known as "Near Rock Creek on the Laramie Plains" has 
long been a puzzle to paleobotanists. A number of planks were re- 
corded from a place thus described, and hence it was a matter of impor- 
tance to fix their horizon. Investigation has shown that there is no 
locality in the vicinity of Rock Creek Station on the Laramie Plains 
that could have afforded these plants, and they came to be regarded 
as practically worthless, because unidentifiable. To Prof. W. C. 
Knight, of the University of Wyoming, is due the honor of solving 
this question. He is perhaps the best-informed geologist on the his- 
tory of early exploration in this locality, for, by going over every part 
of the country with the early reports in hand, he has been able to fix 
nearly all of the old localities and sections. He informs me that when 
the explorations were first begun by Hayden and his assistants, the 
Laramie Plains was almost entirely unsettled and without local names, 
and the specimens were labeled with the name of the nearest known 
locality. As the old stage crossing of Rock Creek was then well 
established, the material collected at the various coal seams, near what 
is now known as Dutton Creek, was labeled "Near Rock Creek on the 
Laramie Plains." The locality has, therefore, no connection with Rock 
Creek Station or vicinity. 
Professor Knight discovered a locality for fossil plants near Dunn's 
ranch on the Laramie River, 6 miles east of Harpers Station on the 
Union Pacific Railroad. This locality afforded a number of fairly well- 
preserved examples of Quereus Lesquereuxiana, and once more this spe- 
cies becomes a known stratigraphic mark. The matrix in which the 
specimens are preserved is a friable yellowish sandstone. 
Habitat. — Carbon, Wyoming. 1 ? "Near Rock Creek, Laramie Plains." 
Dunn's ranch, 6 miles east of Harpers Station, Wyoming. 
QUERCUS DENTONOIDES n. Sp. 
PI. VII, fig. 7. 
Quereus Dentoni Ward, non Lx., Syn. Fl. Lar. Gi\, p. 551, PI. XXXVII, fig. 2 (1886); 
Types Lar. Fl., p. 26, PL X, fig. 1 (1887). 
After some hesitation I have decided to describe this leaf under 
another name. At first sight it does have a strong resemblance to 
Lesquereux's species from the Bad Lauds (Fort Union) of Dakota. As 
Professor Ward has pointed out, this leaf differs in several particulars. 
It is, for instance, more narrowed upward, and was evidently acute 
