Geology and Mineralogy. 387 
strata about the horizon of the Chazy and micaad ear forma- 
: oO ins 
3 an 
the contormability én superposition between the quartzyte and 
_ the same associated formations in many sections through the 
States of Vermont, Massachusetts and Connecticut,—so thor- 
As in Canada, so to ‘the south, the quartzyte often overlies (some- 
ae nearly horizontally) the ‘limestone and schists; but whether 
0 through overturns or not is unsettled.* 
a the course of the writer’s explorations of Berkshire (Massa- 
ehusetts) he was told, when at one of the hotels, of an unknown 
mer in hand, and returned, laden with specimens, at dusk: it was 
Logan in 1866, studying the anadeton as to the relations of the 
limestones and the associated rocks. 
The large, colored, Geological Chart of Canada prepared under 
Logan’s direction, embo ying the results of his survey and also 
through the aid expetially of Professor J a Hall—the distribu- 
tion of the geological formations over the Northern United States 
own to Central Pennsylvania, is another oon work by Logan, 
5 
only American geological map yet published that in exactness 
and fulluess of detail and style of execution compares favorably 
ie. ‘the Zo char ts of the — of epi on 
tains a valuable article on the Quebec Group by Principal Daw- 
>i and a list of Sir William Logan’s more important publica- 
om a. D. 
the Utility a the Method of the Pennsylvania State 
Oat Survey in the Anthracite Field. Extracts from a 
by Bens. Sat Bg tae (late Geologist of Jone?) read 
on the American Institute of Mining Engineers in February. 
* The writer has in progress an investigation bearing on this point. 
