54 TJie American Geologist. Jimuao, isoo 
The Pleistocene. The latter part of the report concerns itself with 
the phenomena of the drift. The pre-Glacial weathering, erosion and 
drainage, and the till with its drumlines are described. Beds of sand 
occur within the till in such manner as to indicate one and perhaps 
two retreats and subsequent advances of the ice, though it does not 
appear that such movements were extensive. The account of the 
Champlain is interesting. On the partial retreat of the ice, the north- 
ward-sloping valleys of the eastern uplands became in many cases the 
seat of glacial dammed lakes. Later, on the retreat of the ice from the 
Connecticut vallej^ this became the seat of an extensive lake, or rather 
of three lakes (Montague, Ho^'oke, Springfield), partly separated from 
one another by the trap ridges. Deposits of sand filled the narrower 
northern Montague lake, but to the south where the valley was wider 
they rose to near the surface only about the border, the central part 
of the lake being filled by finer clay deposits to a hight depending on . 
the original depth of the lake and the distance from the shore. These 
lake shore beds on subsequent elevation became the uppermost vallej- 
terraces — terraces of elevation — and from the sands and clays of the 
old lake the river subsequently carved out its lower terraces — terraces 
of erosion. 
This report represents twenty-five years of geological work, great in 
amount and much of it difficult in kind, which has been accomplished 
by the author practically single-handed and in the intervals of other 
and absorbing work. The report itself is well done and not more 
voluminous than the circumstances permit. Professor Emerson is to 
be congratulated upon its completion, and the reports promised on 
Berkshire and Worcester counties will be awaited with interest. 
L. G. W. 
MONTHLY AUTHORS' CATALOGUE 
OF American Geological Literature, 
Arranged Alphabetically.* 
Adams, Frank D. 
Sir William Dawson. (Science, N. S., vol. lo. p. 905, portrait, Dec. 
22, 1899.) 
Ami, H. M. 
Bellinurus granaevus, a new species of paleozoic limuloid crustacean 
recentlv described by Prof. T. R. Jones and Dr. Henry Woodward, 
from the Eo-Carboniferous of Riversdal'e, Nova Scotia. (Ottawa 
Naturalist, vol. 13, p. 2D7, Dec. 1899.) 
Blake, W. P. 
The Pliocene skull of California, and the flint implements of Table 
mountain. (Jour. Geol., vol. 7, p. 631, Oct.-Nov., 1899.) 
*Tliis list includes titles of articles received up to the 20th of the preceding 
month, including general geology, physiography, paleontology, petrology and 
mineralogy. 
