Geology of the Rocky Mountains. — Coleman. 85 
tier than 45°, and from the softness of the materials the forms 
of the hills are softened and covered with forest or sod. 
Entering the "gap" of the Brazeau and following up the 
river to its sources, we pass a succession of "tilted block" 
mountain ranges, seven in all. Our work was confined to the 
left bank of the river. 
The first mountain was wholly of limestone, somewhat fos- 
siliferous. The specimens obtained were poorly preserved, 
but are described by Mr. Walker as "a ramose Favosites, the 
impression of a brachiopod (Productus?), and three sections 
of gastropods not in condition for further determination, 
probably Devonian." 
The next mountain climbed, a few miles farther up the 
river, was of highly fossiliferous limestone. A stratum near 
the bottom yielded the following species, as determined b}- 
Mr. Walker : 
Atrypa reticularis Link.; several specimens, all of the small variety 
found in Che Chemung group of the Devonian. 
Spirifera disjuncta Sowerby. 
Spirifera cyrtinaeformis H. and W. 
Spirifera orestes 11. and W. 
Orthis iowensis Hall. This, in common with some other Devonian 
species of Orthidae, is doubtless only a variety of (). striatals 
SCHLOTHEIM.* 
Rhynchonella castanea .Meek: young individual. 
Productus subaculeatus Murch. 
Diphvphyllum (Eridophyllum) strictum E. and H. 
The corallites are smaller than in eastern specimens, being- 
only two lines at the widest, with the usual periodic constric- 
tions. In size and arrangement of interior this species agrees 
with D. simcoense Billings, but the calicular gemmation is 
distinctly shown. The second, third, fourth and fifth species 
belong, in the east, to the Chemung group of the Upper De- 
vonian. 
From the next mountain to the southwest only otic fossil 
was obtained, a coral, described as follows: 
Cyathophyllum, sp.? Externally it presents the appearance of Cya- 
thophyllum (Blothrophyllum) decorticatum Billings, and doubtless ii 
belongs to thai -roup. The central area, however, has ni> ilai trans- 
verse diaphragms. The epitheca is removed, ami the outside area pre- 
sents at irregular intervals the extensions of the arched vesicular plates 
as in Blothrophyllum. In cross-sec! ion there is i he typical appearance 
*Cont. Can. Pal., vol. I, pt. in, p. 218. 
