114 The American Geologist. February, 1905 
bearing on the question of glacial erosion. It seems very doubtful 
If the amount of material in the terminal moraine in any measure 
represents the amount of glacial erosion by the glacier; terminal 
moraines of valley glaciers are often much smaller than the lateral 
moraines and in many cases the larger part of the material remov- 
ed has been carried down valley beyond the moraine. While the 
amount of erosion assigned to the glaciers in their middle and 
lower course is insignificant, the amount credited to glacial cirque 
erosion is very great. Professor Lawson agrees with Mr. W. D. 
Johnson as to the importance of this factor in mountain sculpture 
and believes that by this process the surface of the upper part of the 
range has been reduced over large areas to a distance of hundreds 
of feet. 
The paper not only gives an excellent idea of the high Sierra 
in this particular area, but will be very suggestive to any one who 
is interested in the study of land forms in high mountains. L>. G. "W. 
The Geology of the Mount Lofty Ranges. Part 1. The Coastal Dis- 
trict. By Walter Howchin, F. G. S. (Trans. Roy. Soc. South 
Australia, vol. xxviii, 1904.) 
The paper describes at length the Cambrian succession as 
found in South Australia. There is a historical introduction describ- 
ing the work of A. R. C. Selwyn, G. H. F. Ulrich, Ralph Tate, and 
other pioneers. 
Mr. Howchin finds the following order in the South Australian 
Cambrian: 
A Purple Slates, quartzytes and limestones. 
B Silicious, blue, pink and dolomitic limestone. 
c Banded fiine grained clay slates and shales. 
D Glacial till, grit, etc., with erratics. 
E Silicious and felspathic quartzytes and phyllytes. 
The present article describes rocks of the first three divisions. 
In division A beds of limestone are found (up to 100 feet in 
thickness) composed almost exclusively of the remains of Archae- 
ocyathinse. The Lower Cambrian age of this division is also 
determined on the authority of Etheridge and of Tate, by the pres- 
ence of Microdiscus and Salterella. 
Division B contains limestones, etc., that are of considerable 
economic importance being used for "road metal" and the manu- 
facture of Portland (hydraulic) cement. 
There are numerous stone quarries in the slaty rocks of Divis- 
ion C, the material taken out being used for building purposes in 
the city of Adelaide. 
Several fine plates showing flexed and distorted strata of divis- 
ion A at Curlew point and of division B at Field R accompany the 
article. There is also a plate of sections, and a map showing tha 
distribution of the several members of this series. .f. m 
