67 
the rather extensive flora of the Laramie formation. It is hence con- 
clusively shown to belong to the Montana group, but its position in this 
group is not so clear. Four of the forms are common to the Vermejo 
formation, three to the Mesaverde, one to the Judith River, and one to 
the Fruitland. This tends to indicate that its palaeobotanical relations 
are with the older rather than with the younger formations of the Montana 
group, and I can see nothing in the floral evidence which would in any 
way conflict with the prevalent opinion that the Allison formation is more 
or less equivalent with the Eagle sandstone of Montana. It is true that 
the two have no species in common unless the abundant Platan us of the 
Allison is the same as what Knowlton has called Platanus ? wardii from 
the Eagle, but the Eagle has only yielded 7 species and as 6 of these are 
dicotyledons they do not lend themselves to comparison with the prevail- 
ingly nondicotyledonous plants identified from the Allison. These are 
more nearly evaluated by their occurrence in other Montana formations 
of the Western Interior region of North America, and by their range in 
the Upper Cretaceous formations of the Atlantic Coastal Plain, 
A consideration of this last question shows that although Sequoia 
heterophylla , Brachyphyllum macrocarpum , and Geinitzia formosa all occur in 
Coastal Plain formations of Montana age, they all occur in slightly older 
formations of the Coastal Plain, such as the Raritan formation of New 
Jersey or the Tuscaloosa formation of Alabama, and this tends to confirm 
the conclusion, already expressed, that the Allison formation belongs in 
the earlier half of Montana time. 
Pteridophyta 
Asplenium (?) coloradense Knowlton 
Asplenium magnum Hollick (not Knowlton), Torreya, vol. 2, p. 146, PI. 
IV, figs. 1, 2 (1902). 
Asplenium (?) coloradense Knowlton, U.S. Geol. Surv., Prof. Paper 101, 
p. 245, PI. 30, figs. 1, 2 (1917). 
A single distal portion of a pinna and its counterpart (loc. 7759) 
almost certainly represent this species of the Vermejo formation of Colo- 
rado, admirable specimens of which have been figured by Hollick. The 
species has been rather fully described by Knowlton and the specimens 
from the Allison formation add nothing to our knowledge of this form 
except the tendency of the pinnules to develop somewhat remote and 
scarcely perceptible serrations. 
Fern , undeterminable 
Two small fragments of an undeterminable fern were collected at 
locality 7764. They represent a type with narrowly divided pinnules 
such as have been referred in the past to such genera as Sphenopteris, 
Jeanpaulia, Thyrsopteris, etc. 
The present material is too incomplete to permit of comparisons 
with any of the nominal fossil species in the literature, although they are 
not unlike certain fossil forms that have been referred to the probably 
composite species Asplenium dicksonianum Heer. 1 
1 Heer, O.: FI. Foss. Arct., vol. 3, ab. 2, p. 31, PI. 1, figs. 1-^5 (1874), 
