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Geology. . : 123 
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1 
sam regio 
Mr. pr teths Murray makes a report upon the Thessalon and Missis- « 
sauga rivers, givin the results of his topographical examinations, and 
contributing farther information as to the structure of the Huronian rocks, 
which upon Lake Huron attain a thickness of about 10,000 feet and are 
intercalated between the Laurentian and Lower Silurian series. They ar 
made up of quartzites with two great bands of slate conglomerates, — 
masses of interstratified diorites, besides two or more bands of limestone, 
whose distribution has been most serviceable in making out the structure 
of the region. e copper of the Bruce and Wellington mines, of Root 
River and Echo Lake occurs chiefly in veins cuttin the diaries of this 
series, although the metal is also found disseminated in some of the beds. 
fh Murra has considered the disturbances of ibis, set ies of rocks with 
us @ section, together with a map showing the distribution of the Huro- 
nian limestones. A smiaaicarate dislocation occurs in the valley of the 
essalon, bringing the Laurentian gneiss in contact with the upper por- 
tion of the Huronian series by a vertical displacement of 9,200 feet. 
The results obtained by Mr. J. Richardson in an examination of a part 
of the district of Gaspé are next given, with a map showing the distri- 
bution of the rocks. The Shickshock mountains, which are a continua- 
a 
around their southern slope, repose the Devonian rocks. Associated with 
these crystalline schists are great masses of serpentine, which at Mt. Albert 
are seen sweeping around the base of the hills. A remarkable section 
' Serpentine which succeeds to the black eenldanda. slate is beautifully and : 
distinctly stratified. The weathered surfaces exhibit opaque Mises or 
fawn colored bands of from one-eighth of an inc 4 
with deep red bands, sometimes including grains 
sallsge. as well as thin layers of asbestus. 
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