OijisliTxt' ('o7i(/h»iierate. — Gravt. 5 
stones and graywackes to the north, which have been described 
as belonging to the Keewatin series. The exact geographical 
extent of the conglomerate is not fully known; it covers an area 
of nearl}' fifteen miles in the immediate vicinity of Ogishke Muncie 
lake, and has been seen to the north on the west shore of West Sea 
Gull lake and also in Ontario at the northwestern corner of 
Saganaga lake.* There has been no general agreement in regard 
to the relation of the Ogishke conglomerate to the surrounding 
rocks, and so it has seemed advisable, in the light of recently 
discovered facts bearing on this point, to give a brief outline of 
the opinions of the different geologists, who have worked in this 
region, concerning the position of the conglomerate; and also to 
state what is definitely known in regard to this question. 
The first notice and discriptiou of this conglomerate was 
given by Prof. N. H. Winchell in 1882.t In that description he 
applied no particular name to it, but since then it has been 
universall}' known among lake Superior geologists as the 
Ogishke Muncie or Ogishke conglomerate. At first he regarded 
it as part of the series of black slates (Animike) occurring on 
Gunflint lake and also of the series represented by the slaty 
argillytes of the vicinity of Knife lake and westward (Keewatin). J 
On further study, however, the correlation with the latter series 
was entii'ely abandoned, and until 1887 he regarded this con- 
glomerate as the basal member of the Animike. § [See end of 
this paper, paragraph on the use of the term Ogishke conglom- 
erate.] In passing westward from the low dipping Animike of 
Gunflint lake to Ogishke Muncie lake, he says: "There is thus 
seen to be an undeniable gradation from the Animike into the 
[upper] conglomerate. "II "The formation of horizontal slates of 
the vicinity of Gunflint lake and the international boundary is the 
same as the highly tilted slate and quartzyte formation that 
passes into the slaty conglomerate of the region of Ogishke 
Muncie lake.'"** He regards the Ogishke conglomerate as separ- 
*A. C. Lawson, Lake Superior Stratigraphy, Amek. Geologist, vol. 
VII, page 324, May, 1891. 
tGeol. and Nat. Hist. Survey of Minnesota, 10th (1881) Ann. Kept., p. 90. 
Jlbid., pp. 94-95. 
§Ibid., nth (1882) Ann. Kept., p. 170; 15th (1886) Ann. liept., p. 381; 
16th (1887) Ann. Kept., pp. 91, 97-98; 17th (1888) Ann. Kept., pp. 17, 20,24, 
47; Amer. Geologist, vol. I, pp. 11-14, Jan., 1888. 
ilGeol. and Nat. Hist. Survey of Minn., 16th (1887) Ann. Kept., p. 91. 
**Ibid., 17th (1888) Ann. Kept., p. 17. 
