MINERALS AND GEOLOGY OF CANADA. 195 
Bay ; at Granite Islet, Point Porphyry, Edward Island, the mouth 
of the Neepigon River, the Battle Islands, St. Ignace, Michipicoten, 
Cape Gargantua, Batchehwahnung Bay, and Mamainse. (Various 
interésting details respecting these and other less prominent localities 
of the rocks in question, will be found in the Revised Report on the 
Geology of Canada by Sir William Logan and his colleagues.) 
The Chazy Formation:—This series of strata derives its name 
from the town of Chazy, in Clinton county, N. Y. It forms a tran- 
sition series between the underlying Calciferous beds and the over- 
lying deposits of the Trenton Group. In Canada, it consists 
principally of grey, brownish-black, and other coloured limestones, 
with shales and calcareous sandstones, the latter chiefly at the base of 
the formation. The limestones are sometimes dolomitic, and some- 
times bituminous; and they exhibit in places a concretionary struc- 
ture. Many are highly fossiliferous. Some of the more common 
fossils comprise Leperditia Canadensis (a bivalve entamostracan, fig. 
163), and Rhynconella plena (a brachiopod, fig. 164). Also, the 
coral Stenopora fibrosa (fig. 165a), which ranges into the higher rocks ; 
Fig. 163.—Leperditia Canadensis 
(Jones). 
ki 
Fig. 165.—a. Stenopora fibrosa (Goldfuss). Fiz. 166.—Bathyurus 
6. Bolboporites Americanus (Billings). Angelini (Billings). 
ce. Lingula Lyellii (Billings). 
a peculiar form of uncertain character, Bolboporites Americanus (fig. 
165 6); and Lingula Lyellii (fig. 165 ¢). This latter fossil at Allu- 
