Article II . — Spo7iges in Laurentian Rocks. 
45 
schists, quartzites, limestones, etc., which have been referred 
to the Laurentian system. The quartzites and limestones 
occupy basins in the gneiss and constitute an upper series. 
Three basins are known, two within the city limits and one 
to the northward of them, in Kennebecasis Bay. There are 
three principal sets of strata in these basins, viz. : Near the 
base schistose beds with limestones ; in the middle quartzites 
and silicious slates ; and towards the summit limestones with 
silicious and graphitic slates. This is the general succession, 
but further study is required to determine the parallelism of the 
several members in the different basins. The whole of these 
Laurentian rocks are separated from the Cambrian by a great 
mass of intermediate rocks usually denominated Huronian. 
We thus have below the Cambrian rocks the following 
descending succession: 
1 Thickness. 
Coastal series (or system), 1872. — Grits, hydromicaschists, 
argillites, etc. ; resembling the Pebidian rocks of Dr. H. Hicks, 
COLDBROOK SERIES (oR SYSTEM), 1805. — Dioi’ites, felsites, petro- 
silex, etc.; resembhng the Arvonian rocks of Dr. Hicks. 
Thickness more than 
10.000 feet. 
15.000 “ * 
d 
Upper series (or system) op Laurentian, 1872. 
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cr 
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Lil 
Upper division. Argillites, limestones, graphitic shales. 
Fossils. In upper part of the upper hmestones of the South 
basin, fragmental Eozoor, observed by Sir J.W. Dawson in 
specimens sent him. In middle of upper limestones in 
Middle basin, spicules of sponges. In graphitic shale of South 
basin spicules of Halichondrites graphitiferus. In lowest 
limestone of the Middle basin, the reef of columnar fossils 
described in the preceding article (Article I.) 
Middle division. Quartzites, siliceous schists. Fossils Cyath- 
ospongia (‘0 eozoica near the top of this division, 
740 “ 
450 “ 
— 
Lower division. Limestones and gneisses. No Fossils known. 
Lower series of Laurentian. Gneisses, IVIicaschists, etc., 
260 “ t 
* The above thicknesses are on the authority of Dr. L. W. Bailey. Report Pro- 
gress Geological Survey Canada, 1879. pp. 10, D. D. and 21, D. D. Dr. R. W. Ells in 
the same Report, p, 6, D., describes these rocks, sixty miles east of St. John, as one 
system, with a thickness of 14,000 feet. 
t Fuller descriptions of these rocks may be found in Rep. Proer. Geol, Surv. of 
Canada, 1872. pp. :10, 34, etc. 
