VERMONT AND WESTERN MASSACHUSETTS. 443 



Lower Silurian, citing Mather's opinion to tlie same effect. (Am. Jour. 

 Sci., (2) XVlll., pp. lU5-lti8.) 



lu 18G1 Dr. Hunt once more stated his opinion very fully with regard 

 to the relations of the formations of the Appalachian chain to those 

 studied out in Canada by the Geological Survey. He closed with the 

 following statement : — 



" It will be seen from what has been previously said that we look upon the 

 1st and 2d divisions described by Mr. Sufford in Eastern Tennessee, as corre- 

 sponding to the hypozoic series of Rogers and to the Green mountain gneissic 

 formation, which instead of being beneath the Silurian series, is really a por- 

 tion of the Quebec group more or less metamorphosed, so that we recognize 

 nothing in New England or southeastern Canada lower than the Silxu-ian sy.s- 

 tem, nor do we at present see any evidence of older strata, such as Laurentian 

 or Huronian, in any part of the Appalachian chain. The general conclusions 

 which we have previously expressed with regard to the lithulogical, chemical 

 and mineral relations of the Green mountain rocks remain unchanged. (This 

 Journal [2], IX, 12)." (Am. Jour. Sci., 1861, (2) XXXI., pp. 392-414.) 



In the Geology of Canada, 1863, the Green Mountains of Vermont 

 were still regarded as belonging to the Quebec group, as above given in 

 the preceding papers, and as being of Lower Silurian age. (See also 

 Am. Jour. Sci., 1803, (2) XXXVI., pp. 214-226.) 



In the Geology of Canada, 1866, Dr. Hunt stated : — 



" Between the Potsdam and Chazy periods, a rapid continental elevation, 

 and subsequent gradual depression, allowed a great accumulation of deposits, 



which now appear in the rocks of the Green Mountain range To this [the 



Upper Calciferous] succeeds the Quebec group, which is regarded as occupying 

 a position in the series between the Calciferous and Chazy formations. The 

 members inferior to it have not yet been observed in eastern Canada, nor, with 

 the exception of the Potsdam of St. Albans and Georgia in Vermont .... 

 The Quebec group constitutes the great metalliferous region of eastern Canada, 

 Vermont and Newfoundknd ; and the Upper Copper-bearing series of Lake 

 Superior, in which the principal mines of that region are found, belongs to the 

 same geological horizon." (I. c, pp. 235-237.) 



In 1867 Dr. Hunt said that the Quebec group formed the Appalachian 

 region of Canada and Vermont, as well as the metalliferous terranes of 

 Lake Superior. He then, considered the Quebec group as being the 

 equivalent of the Landeilo, and occupying a position between the L^pper 

 Calciferous and Chazy. He further remarked that this group formed 

 the Notre-Dame Mountains in Canada, and the Green Mountains in 

 Vermont, and that it played a very important rdle throughout the Appa- 

 lachian chain. (Esquisse Geologique du Canada, pp. 5, 6, 12-16.) 



