88 The American -Geologist. August, 1894 
thai the exterior characters cannol be determined. They are larger 
than those i 1 1 ust rated by Hall. 
Pari of a valve of a Productus, showing numerous spines. 
( !as1 of a Bellerophon . 
Zaphrentis prolifica Billings; k single specimen. 
Syringopora perelegans Billings. 
These arc all from the Upper Devonian. The first is found in the 
state of New York only in the Chemung group; bul elsewhere it ranges 
from the Middle to the Upper Devonian, inclusive The nexl to the 
lasi species is found in the east in the Upper Helderberg and Hamilton 
groups. The last appears to be confined to the Upper Helderberg in the 
east, bu1 Walcotl slates that in Nevada it is found throughout the 
whole Devonian series.* 
Turning northwest from the headwaters of the Brazeau, we 
find along Jonas pass steep quartzite mountains dipping in 
the usual way; and the same continue along the right bank 
of the Sun-wapta, the eastern branch of the Athabasca, and 
more or less along the main river as far as to Athabasca falls. 
a distance of about fifty miles. Above the mouth of Jonas 
creek, on the west bank of the Sun-wapta, a mountain rising- 
above 10,000 feet is of limestone. 
Southwest of the Sun-wapta and of the Athabasca below 
the junction of the former river, the mountains no longer have 
the regularity observed in the northeastern portion of the 
Rockies. The subordinate ranges lose the uniform northwest 
and southeast trend so characteristic farther east. The river 
valleys can no longer be divided into two sharply defined di- 
rections, one parallel to the strike of the tilted blocks and the 
other transverse to it. Many of the mountains, such as For- 
tress and Quincy, near Fortress lake, are of the castellated or 
cathedral type with nearly horizontal strata and very steep 
walls, the result of erosion. The rocks observed east and 
north of Fortress lake are purplish quartzites and quartzitic 
conglomerates. South of the lake, along Misty creek, bluish 
grey limestones with 3^ellowish streaks occur, and the strata 
dip toward the south, while the mountains present a bold front 
northward. 
Misty mountain, 10,000 feet, in lat. 52° 20', long. 118°, con- 
sists chiefly of limestones showing bluish gre}^ and yellowish 
bands or concretions. The moraine of a glacier descending 
*U. s. Geol. Survey, Mc graph viii, 1884, Paleontology of theEureka 
I >isi rict, p. 5. 
