239 



CHAP. XXXVI. 



SURFACE GEOLOGY. 



Geographical Bound abies, — The Basin of Lake Winnipeg. — Limits. — 



Elevation of its Boundaries. — Outlet. — Area. — Character of its Rim. 



Surface Features. — Area of Low Lake Region. — Terraces of Pembina 

 Mountain. — Escarpment of the Riding, Duck, &c. &c. Mountains. — Prairie 

 Plateau of Rupert's Land. — Plains of the North- West. — Table of Ele- 

 vations. — Detached Hills. — Country east of Lake Winnipeg. — Lakes. — 



Direction of Elevating Forces. — Steps to the Height of Land. 



Grooved, Scratched, and Polished Rocks. — On Baril Portage. — On 



Winnipeg River. — On Limestones of Lake Manitobah. Drift. — Over 



the Country between Lake Superior and Winnipeg. — Lacustrine Deposits. 

 — Drift on the Souris. — On the South Branch. — Forced Arrangement of. 

 — In Blue Clay at Toronto. — Description of this Arrangement. — Sorting 

 of Materials. — Agency of Water and Ice. — Glacial Ice. — Tiers of Boulders 

 on the South Branch. — Layers of Stratified Mud. Erratics. — Distri- 

 bution of. — Effects of Ice on Lake Winnipeg. — In Lake Manitobah. — On 

 the Red River Prairies. Beaches and Terraces. — Great Dog- 

 Portage. — Section of. — Beaches on Lake Superior. — On Prairie Portage. 

 — The Big Ridge. — White Mud River Ridge. — Dauphin Lake Ridge. — 

 Prairie Ridges. — Pembina Mountain. — Ridge, character of. — Riding and 

 Duck Moimtain Ridges. — Conical Hills. — Bear Hill. — Second Tier of 

 Conical Hills. Sand Hills and Dunes. — Ranges. Circular De- 

 pressions. — Character of. Denudation. — In the Basin of Lake Win- 

 nipeg. — Parallelism of bold Limits of Denudation. — Grand Coteau de 

 Missouri. — Niagara Limestone Escarpment of New York and Canada. — 

 Riding and Duck Mountains, &c. — Probable common Origin of. — Dislo- 

 cations in the Basin of Lake Winnipeg. 



GEOGRAPHICAL BOUNDARIES. 



The Basin of Lake Winnipeg, including under this 

 general term the country drained by the rivers flowing 

 into it, extends from the 90th to the 118th meridian. 



