6 The Americmi Geologist. jniy, 1892 
attHl from the Koewatin b}- an overlap unconformity.* and in 
correlating it with rocks of other parts of the lake Superior region 
he makes it the Minnesota equivalent of the lower slate conglomerate 
of the original Huronian.f thus putting it as the basal member of 
the original Huronian group. 
Dr. Alexander Winchell, while admitting the possibility of the 
Ogishke conglomerate being part of the Animike, + still firmly 
believed it to be much older and an upper part of the Keewatin. I 
'■'■The. prima facie evidence would make»it part of the Keewatin 
system, conformable in structure and consecutive in history. "'|| 
"Lithologically and stratigraphically, therefore, the identification 
[of the Ogishke conglomerate with the Keewatin] seems to be com- 
plete. ****** Qn structural as well as lithological 
grounds the conglomerate seems to belong to the Keewatin series. "** 
"Of this, however, I feel authorized to testify — the range of rocks 
lying within the field of m^^ explorations in Minnesota, represents 
but o»e system, "tt Later he said that he regarded the Ogishke 
conglomerate as a basal conglomerate ;++ he probabh' meant the 
basal member of a division of the Keewatin. as he certainly did 
not regard it as at the base of the Keewatin. 
Prof. R. D. Irving thought that the Animike slates of (Tunfiint 
lake were once continuous with the folded slates of the region of 
Knife and Ogishke Muncie lakes, and that these latter were part 
of the Vermilion lake series of slates (Keewatin). §§ '-His (Mr. 
W. M. Chauvenet's) work thus far, as also the results of our 
microscopic stud}' of the sections gathered, has tended to show 
that the Knife lake schists are actually the Animike slates in a 
folded condition. "II II "The folded schists of Knife and King- 
*Ibid., p. 68. 
fThe Animike black slates and quartzyt^s and the Ogishke conglom 
erate of Minnesota, the equivalents of the "original Huronian," Amek. 
Geologist, vol. I, pp. 11-14, Jan., 1888. 
JGeol. and Nat. Hist. Survey of Minn., 16th, (1887) Ann. Kept, pp. 
349, 359. 
gibid., loth (1886) Ann. Kept., pp. 179, 194-195: 16th (1887) Ann. Kept., 
pp. 344-350, 359-360; Proceedings of A. A. A. S., XXXVIII, 1889. 
iiieth (1887) Ann. Kept., Minn. Survey, p. 347. 
**Ibid., p. 348. 
ttTbid., 15th (1886) Ann. Kept., p. 195. At this time he had not seen the 
Animike. 
JJIbid., 18th (1889) Ann. Kept., p. 215; foot note. 
§§U. S. Geol. Survey, 5th Ann. Kept., pp, 206-207. 
II II Ibid., p. 207. 
