996 The Crystalline Rocks of the Northwest. [October, | 
ther north in Washington county, New York. It is to be remem- 
bered, also, that the schists of Mt. Washington are distinctly 
different from those of Southern Vermont containing the Tren- 
ton fossils found by Mr. Wing, “a change ” taking place in them 
not far south from the point at which the fossils were found, con 
tinuing thence to the southern extremity of Mt. Washington! 
We are now, however, confronted with another difficulty, The 
geologists of Michigan and Wisconsin have set aside Dr, Em 
mons’ identification of the Menominee rocks with the Taconic 
in 1846, and have called them Huronian, the same that has been 
done in North Carolina by Mr. Kerr, parallelizing them with the 
Canadian system, which in 1855 was so named by Dr. T. Sterry 
2 
It becomes necessary, therefore, to ascertain of what the Hu- 
ronian consists. Dr. Hunt sets out with the statement that it 
was designed to include the younger and unconformable series of 
metamorphic rocks found on the shore of Lake Huron andin 
the valley of the Thessalon river, “and also the so-called vol- 
canic formations of Lake Superior.” Thus the avowed intent 
was the same as that of Dr. Emmons in erecting the Taconite 
system. If we seek for the actual stratigraphic and mineralogi- 
cal characters of these rocks, we shall find them in the geological 
reports of the Canadian survey, particularly that of 1863. 
In descending order the original Huronian consists of the fol 
lowing strata, disregarding the diorites and other “ greenstone 
all of which are thought by Logan to be of igneous orgit 
though included in the thickness given. 
ONE a ce cheese she stuns mr 
TOE Ee Dos? eae E ies Pipers Ce . . 200 “ 
White q a ess whe bea E bec Uieicbeeeess nae 
Limestone, siliceous and cherty..........ccseceeeceeeseee?* ee 3 
White TONO aa ee Cone nccevervecscerer® 2979 
Red jasper conglomerate ,... het gaat rT ah ; 
E a aala ae E La 2300 Í 
Sate opone Mee a Cee goo 
E a as eiie r E adie st 
ee as .. 1280 “ 
White quartzite......... kareak aR O EPR E E T o 1000 s 
E SO epidotie a A L E ees 2000 : 
E 5 Se ccicis iss cvsbooote ath 
—_— 
aaa A 18000, 
1 Dana Am Jour. Sci. ( 
Bo mien. g wong ~ Het. (3), XVII, 376. 
2 s - Fi . 4 
Equisse geologique du Canada; Azoic rocks, Rep. E, p. 72» 
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