324 The American Geologist. November. i90i. 
This fault was formed after the deposition of the lake Superior 
standstone and the effect on the traps was extensive and remarkable. 
They are brecciated and reduced to extreme fineness sometimes for a 
distance of 400 feet from the fault plane but the sandstone, which lies 
on the north side and which has suffered a great down-throw, is 
rather thrown into a series of folds, or is broken into large faulted 
blocks, bending upward, even at sixty degrees from the horizon, at 
the fault plane. 
It might have been well had Dr. Grant given some of the evidence 
of the long erosion interval which be alludes to as one of the steps 
in the geological history of Douglas county, said to have occurred be- 
tween the sedimentary beds of the upper Keweenawan and the lake 
Superior sandstone. This is a mooted question. Evidently no proof 
of such erosion interval occurs within the field reported on, else it 
would have been mentioned. This erosion interval, however, was one 
of the tenets of the older Wisconsin survey and it seems to have been 
adopted by Dr. Grant without question. In a preliminary and sub- 
ordinate report, however, devoted largely to economic facts, and to the 
description of the field geology, it would have been impossible to have 
gone into a theoretical question of that nature. In the writer's opin- 
ion there was no such erosion interval, but instead there was a pro- 
gressive subsidence in the lake Superior region, followed later by 
flexure, faulting, and elevation above the sea. N. H. w. 
An investigation of the buried valley of Wyoming. William Grif- 
fith. (Read before the Wj'oming Historical and Geological Society. 
Jan. II, 1901. Wilkesbarre, Pa.) 
This old valley has long been known. It has been he cause of dif- 
ficulty and some fatalities in the mining of the coal at Wilkesbarre. 
It is filled with gravel and sand, and other coarser drift, to the depth 
of 200 or 300 feet. If this filling could be removed there would be 
seen a lake eighteen miles long and a mile in width through which 
the Susquehanna river would flow. This river now flows along the 
surface of the gravel bed, but slightly impinging upon the rock rim. It 
is evident that this gravel is permeated by water for sometimes in min- 
ing operations both gravel and water rush into the mines that pass 
into the limits of the gorge. This gorge is an interesting example of 
the condition of the surface of the country previous to the drift age. 
N. H. \v. 
MONTHLY AUTHOR'S CATALOGUE 
OF AMERICAN GEOLOGICAL LITERATURE 
ARRANGED ALPHABETICALLY. 
Adams, C. C. 
Baseleveliiig and its P'aunal significance, with illustrations from 
southeastern United States. (Am. Nat., vol. 25, p. 839, Oct., 1901.) 
