ab 
ae M4 I 
Of iron (limonite) occurs in the Potsdam sandstone. 
* Montreg) 3 by J. W. Dawson, LL.D., Principal of MeGill Coll 
ae labe 
P Wenoo y : he reviews the facts before 
Be Mtn ang Lot Montresl. In he ee ee eid the localities, 
Geology. ‘ 275 
rt cad by Dr. Falconer is preceded by the able anniversary addr 
esident Colonel J. E. Portlo 
species from the Coal Measures at Medlock Park Bridge, named Pygo- 
cephalus Cooperi, which he regards as related to the Squillidee. 
= 100. The same kind of ore oceurs also at Hartford, Washington Co., 
fourteen miles southeast of Iron Ridge, where the bed is six to seven feet 
thick; and in the town of Depere, eighty miles north-northeast of Iron 
aos six and a half feet thick. , 
ore is conformable to the lamination of the schists and is sometimes 
banded with quartz; the beds are six to forty feet wide, occurring in 
Several alternations, and are inexhaustible. They are related in charaeter 
f the Lake Superior region described by Foster and Whitney, 
and also to those of Northern New York ; : 
xd. Specular and titaniferous ores occur in Baraboo valley in quartzite 
Which is the hardened Potsdam sandstone. It is laminated, slightly 
aboaae and has a high lustre; it is slightly magnetic. The ore is sot 
Undant, 
4th. At ronton, in the town of Marston, Sauk County, hydrated oxyd 
The bed averages 
five feet in thickness, : piel. 
On the Newer Pliocene and Post-pliocene deposits of the peor. 
e na- 
dian Naturalist and Geologist, ii, 401.)—Mr. Dawson has added much by 
'S labors to our knowledge of the Post-pliocene deposits of the St. Law- 
Wn and gives descriptions of some new ; 
apacther with prdtesiy Lptioe on the region. We cite some of the 
Ments, ‘ 
_ The mountai i real has strongly marked sea-margins at 
heights of ereeerace eet feet shore hike St. Peter on the St. 
hi rence (or 450, 420, 366, and 200 above the river at Montreal). The 
“st contains sea shells of existing species. 
