347 
On Eozcin Cunadense. 
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Boecting the earth’s crust were in operation 
now. In the conglomerates of the Hu- 
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4 “wo0zoxyr 
PANY aor 
“WN AWOg 
its ga. crystalline condition before the 
deposit of the newer formatio on; while in- 
state PR with the Laurentian “Timeatones 
dd “9 
"UBLIN[IG AOALOTT “D> 
of an older laminated sand-rock, and the 
formation < these beds leads us still further 
into the pas 
“Tn both he Upper and Lower Lauren- 
tian series there are several zones of lime- 
a each of sufficient volume to constitute 
an independent formation. ese 
careous masses it has been ascertained that 
three, at least, belong to the Lower Lauren- 
tian. But as we do not.as yet ean with 
certainty either the base or the summit of 
this series, these three may be conformably 
followed by many more. thoug 
Lower and’ Upper Laurentian rocks spread 
Over more than 200,000 square miles in 
Canada, only about 1500 square miles have 
--yet been fully and connectedly examined in 
any one district; and it is still impossible to 
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n this connection are given the two 8 
lowing sections, which serve to show 
Structure of the Lower Laurentian ae 
and their relation to the overlying Labrador 
and Lower Silurian series. 
Eozodn Canadense occurs at Gren- 
ville, and in the Petite Nation seigniory at 
cme two points indicated in the first section, 
and in both places in the third or upper- 
Most band of the Lower Laurentian lime- 
ne. The same fossil has ite ~ ob- 
tained 2 the south of the Ottawa, in Bur- 
og and farther west at the aad pw tated 
9n the Ottawa, in both instances in a limestone band whose pre: 
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