460 STRATIGRAPHICAL GEOLOGY. 



Lower Co I db rook. 



5. Greenish-gray clay and micaceous slates, with slaty dolomite. 



4(5. Feldspathic and dioritic sandstones, with chlorite and epidote. 



4«. Sandstones, chloritic schist, diorite, and especially petrosilex. 



3. Fine gray dark diorites. 



2. Pinkish or white felsites, and feldspathic quartzites, \ . , . , 



^ ^ \ half a mile thick. 



I. Diorites, ) 



In other sections of the jDrovince the red felsites and dolomites are both more promi- 

 nent than in the Coldbrook series above. 



Views of Thomas Macfarlane. 



Allusion has been made (vol. i, p. 532) to the views of this gentleman, erroneously 

 said to be James, who is well known for his book on the Coal Regions of America. 

 Mr. Thomas Macfarlane thinks he was improperly referred to by Dr. Hunt, and has 

 taken the pains to state his views concisely in the Canadian Naturalist for 1871. He 

 commences by remarking upon the incongruity of Logan's map, in representing by a 

 single color the metamorphic Quebec group of Eastern Canada, the Calciferous sand- 

 stone, and the upper copper-bearing rocks of Lake Superior. I will quote from what 

 he says respecting the Huronian and Cambrian rocks of Canada, which of course applies 

 equally well to our Connecticut Valley Huronian, their southern continuation. 



" In referring to the gneissic series of the Green Mountains, Dr. Hunt makes mention 

 of my having, in 1862, 'ventured to unite it with the Huronian system.'* I am not 

 aware of ever having done this, nor do I think that there are even good lithological 

 reasons for assuming the identity of the two series. In the paper referred to by Dr. 

 Hunt, in which I instituted a comparison betwixt the rocks of Norway and Canada, I 

 endeavored to point out the resemblance between the rocks of Tellemarken, or the 

 quartzose group of the Urschiefcr, and Sir W. E. Logan's Huronian series, as devel- 

 oped on the north shore of Lake Huron. As differing from these, I expressly distin- 

 guished the Dovrefjeld slates, the schistose group of the Urschiefer, and pointed out 

 their resemblance to the semi-crystalline schists of Vermont and Eastern Canada. 

 The lithological differences betwixt the Tellemarken rocks and the Dovrefjeld slates in 

 Norway are just as decided as between the Huronian series and the Green Mountain 

 schists in North America. Enormous beds of quartzite, and perhaps felsite and pecul- 

 iar conglomerates, characterize the Huronian, while micaceous, chloritic, and argilla- 

 ceous schists and serpentines distinguish the Green Mountain rocks. It may be that 

 these differences are not sufficient to justify us in regarding them as belonging to differ- 

 ent formations, but they would seem to afford grounds for distinguishing them as 

 groups. Therefore in my paper on the subject f I have separated the quartzose from 

 the schistose division of the Urschiefer, the former and not the latter being identified 

 with the Huronian. If it were considered advisable to distinguish the Green Mountain 



* Dr. //tint's Address, p. 33. f Canadian Natura/ist , vii, 161. 



