988 LHE JOURNAL OF GHOLOGY. 
fault showing the Cambrian over the Silurian. The fault is twelve to 
eighteen miles long. In Danby the ridge is crossed by a zigzag E.-W. 
transverse reverse fault bringing the Cambrian to the level of the 
Silurian with a vertical displacement of 1450 feet, accounting for a 
large part of the height of Dorset Mountain. 
Notes on the Stratigraphy of the Cambro-Silurian Rocks of Eastern 
Manitoba. WD. B. DowLincG, B.A.Sc. Ottawa Naturalist, Vol. IX., 
No. 3. 
Below the Hudson River shales, the limestones are provisionally 
divided into a lower and upper Mottled, with a dividing band of fine 
grained limestone holding cherty nodules. The basal member of the 
series is a soft sandstone with shaly partings grading downwards to a 
friable sandstone which may be correlated with the St. Peter’s sand- 
stone. The distribution of these divisions is discussed and shown on 
a sketch map. The thickness of the formation is estimated from 
exposures on Lake Winnipeg at 580 feet. This is compared with sec- 
tions obtained from borings within the district. 4 
Tertiary Revolution in the Topography of the Pacific Coast. By J. 8. 
DILLER. U.S. Geol. Survey, 14th Ann. Report, pp. 397-434. 
An ancient peneplain is traced about the northern portion of the 
Sacramento valley and the western slope of the Sierra Nevada. It was 
once covered with residual material that gave rise to the earlier 
auriferous gravels. 
The topographic revolution consisted in the development out of 
such lowland conditions of the conspicuous mountain ranges of today. 
The northern end of the Sierra Nevada was raised at least 4000 feet, 
and a fault was formed along the eastern escarpment. As the uplift 
progressed the rejuvenated streams at first accumulated the auriferous 
gravels and finally, displaced by volcanic flows, cut deep canyons down 
the western slope of the range. 
The Kame-Moraine at Rochester, New York. By WH. L. FatrRcuHILp. 
Am. Geologist, Vol. XVI., July 1895. 
The “Pinnacle” hills at Rochester, New York, with their complex 
and puzzling structure, are explained as a frontal moraine, with a pre- 
