SECTION IV., 1900 [187 ] Trans. R. S. C. 
IX.—Synopsis of the Geology of Canada. (Being a Summary of the 
principal terms employed in Canadian Geological Nomenclature.) 
By Henry M. Ami, M.A., D.Sc., F.G.S. 
(Read May 29, 1900.) 
INTRODUCTION. 
In describing the various geological formations which compose the 
earth’s crust in the Dominion of Canada it is the purpose of the writer 
to add such notes on the geological structure of other portions of British 
North America (which portions we hope will sooner or later form part 
of our great Dominion) as will show the relation which exists between 
them and its present divisions. 
For the sake of convenience, and to a great extent depending upon 
its physiographical as well as geological characters, British North Amer- 
ica will be divided into five sections or regions, and the descriptions 
given of the various geological formations will proceed, as nearly as 
possible, from the east in a westerly direction as follows :— 
I.—The Acadian Region, comprising the Maritime provinces of Nova 
Scotia, New Brunswick and Prince Edward Island; also Newfoundland 
and Gaspé peninsula, together with that portion of the province of Que- 
bec south-east of the great Champlain-Appalachian fault or disloca- 
tion which runs in the Gulf and River as well as along the south shore 
of the St. Lawrence through Quebec city, and west, to St. Nicholas, 
then to the north-east corner of Lake Champlain, and proceeding in 
a southerly direction through the New England States, as far south as 
Alabama. 
Il.—The Lawrencian Lowlands, which extend from Anticosti west 
to the City of Quebec and to Lake Huron including the Huron-Erie 
Peninsula of Ontario, South Eastern Ontario, the Ottawa Paleozoic 
Basin, and the flat-lying Paleozoic sediments of the province of Quebec. 
IlIl.—The Laurentian Highlands, which include the great penin- 
sula of Labrador to the east of Hudson Bay and the Archean country to 
the west and north-west of the same bay. 
IV.—The Interior Continental Plain, which runs north from the 
49th parallel towards the Arctic ocean and embraces Manitoba, Assini- 
boia, Alberta, Saskatchewan, and portions of the districts of Athabasca, 
MacKenzie, and Franklin. 
Sec. IV., 1900. 10. 
