Conglomerates in Gneissic Ter nines — A. WiuchelL 155 
Throughout the whole extent of these three granitic masses, 
as far as explored, rounded pebbles are found disseminated. 
They are bv no means uniformly distributed; and in the Bass¬ 
wood and White Iron granites they are infrequent. They are 
however, mentioned in my reports.* The Saganaga granite 
{syenite, gneiss) is more numerously supplied with them. In 
-coasting along the shores of West Seagull, Seagull, Bed-rock, 
Granite and Saganaga lakes, one or more pebbles may generally 
be seen at intervals of one or two rods. On the north shore of 
Seagull lake they become rather abundant.f The pebbles here, 
as elsewhere, are distinctly limited and fully rounded, presenting 
the ordinary appearance of shore pebbles, and generally of a 
dark color. In size they range mostly from two to six inches 
in diameter. They are sometimes so firmly imbedded in the 
gneiss as not to be separable from it; at other times, they may 
be removed. In mineral character, many of the pebbles appear 
diabasie, chloritie and augitic. Some of them are syenitic, and 
even approach the Saganaga syenite in character. I found peb¬ 
bles of this which themselves embraced fine granulite, chlorite 
rock, chlorite schist and copper carbonate. Other syenitic peb¬ 
bles were fine-grained and unlike the Saganaga variety; and 
these in other cases, were stratified. Besides worn fragments, 
the outlines of large angular masses may be traced in the midst 
of the usual gneiss. Some of them are a fine-grained granulite 
with a very little hornblende. They attain a length in some 
cases of several feet, with a width of a foot or less. In other 
cases the} r appear like sheets three or four inches thick. They 
are all firmly united to the common mass of gneiss. 
At another locality on the shore of a large island in the same 
lake, a real conglomerate occurs. This is ehlorito-graywacke- 
nitic, and somewhat resembles the remarkable Ogishke-conglom- 
erate, but it is not the same. The groundmass holding the 
pebbles is not of a syenitic character, but rather graywacke-like, 
though the whole is surrounded by the prevailing syenite of the 
region. 
A conglomerate is also reported to me from an inland position 
on the northwest of West Seagull lake. 
* XVth Ann. Rep. Geol. Minn., pp. 79, 85, 88, 105, 113. In other lakes, 
XVItk Ann. Rep. Geol. Minn., pp. 227, 229, 241. 
t See details of facts in XVftli Ann. Hep. Minn., p. 298. 
