50 Gy Lah Lal INCI C OES 
enced his successor Zadock Thompson to draw up an elaborate 
section along the Winooski River between Burlington and Water- 
bury, exhibiting a fan-shaped stratification. After taking charge 
of the Vermont survey, my father commissioned me to measure 
and protract on paper the thirteen general sections across the 
state. From these plans he drew various conclusions, including 
the anticlinal attitude of the Green Mountains, without referring 
either to his theoretical Hoosac section of 1847, or to the Cana- 
dian belief in a synclinal, or to its importance in the development 
of the more eastern terranes. Since 18617 I have several times 
insisted upon the fact and its importance, maintaining at first 
that Logan’s description of Sutton Mountain favored the anti- 
clinal view. Selwyn corrected Logan’s error in 1877. Professor 
Dana acquiesced in this view in 1882. Of late it has been con- 
firmed by Professor Pumpelly? for the Hoosac Mountain, and by 
Mir Gol Whittles tor themrange abel itm toll. ne Att amyaeiinet 
visit to Montreal (1857) Sir W. E. Logan referred the chief 
part of Canada adjoining Vermont to the Oneida conglomerate. 
After 1860 he devised the ‘‘Quebec group,” subdivided into the 
Levis, Lauzon, and Sillery formations, supposed to be allied to 
the Calciferous and Chazy. It was his coloration of the maps 
next the international boundary, classified into these three divis- 
ions, that I copied on my map of New Hampshire as part of the 
Huronian, or the hydro-mica schists. In my first two annual 
reports I used the name of Quebec for these rocks, changing later 
at the instance of Dr. Hunt, who claimed them to be partly, at 
least, older than Cambrian, or equivalent to the Huronian of 
Ontario. Our use of terms was dependent upon the terminology 
employed by our Canadian neighbors, as they were the origina- 
tors of the various expressions employed. Still another modif- 
cation of the nomenclature will be presently alluded to. 
Topographical results —TYhe map in our atlas was drawn upon 
Geological sections across New Hampshire and Vermont, Bull. Am. Mus., N. Y., 
Wolk ly, nev 
2 Geology of the Green Mountains in Massachusetts. Monograph XXIII. of the 
Wo So Ge So 
3 JOURNAL OF GEOLOGY, Vol. IL., p. 296. 
