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RAFFIC

FHYSIOGRAFHY

Mackenzie mountains vccupy the greater part of the e between

cpresented on the map and jorm à dit

ns jlowing intothe Arctic vceur and streams floing in ring sea. They are regarded as a northern member ‘ Hocky Mountain system and hare a maxrimaon tidth

ut 300 miles, measured along the Macmillan and

« el riveræ. They extend jor about 700 miles north-

tu from Liard river almostto l'orcupine river. The # enxie system has resulted from long continued, differr 1 eresion acting on an mplijied, dejormed arem no 0 sented by a complirated group of irregular masses emith umerous penks rising to heights of betuwern 6,500

au 73,500 feet above sralerel.

Farc of Mount Sekaré, on Grarel river, the mountains

d sin form, atrurture and colour from those to the test 6j tot point, The western portion of the apatem has been * tel to long continued érosion, the ralleys are wide , : forest covered salopes rising in easy Curress t nd the } » peaks are set well back jromthe valley hottoms. In Î istern portion the mountains are evidentiy ina more 0 hjul topographie stage: they are more massire and

d,anud the drainage cha.nels are confined in narrotër ' us having stevp, barren or partly woodeit salopes 0j rock

talus

he region lning west of the Mac enxie mourtains

LCA comparatively Lou relief, the hills having general eteration j'about 5,000 jert above ara-lerel or 0f 2,000 feet abore the levels of the principal rivers. The region is characterized by long, yently sloping, irregular hills covered almost to their summits arith a thing rouwth of small spruce and balsam and the main rivers and their chief tributaries occupy ertenaive, well dereloped valleus. These ralleys hace fairly 21 duurs, often several miles in width, and contain many

small lakes and ponds, also extensire bearer meadotes and groves of good spruce. Ti 8 type of country occupies « belt extending southeasterly fromthe Petlly mountains, (ar

isolated, high group\,tothe Mackenzie mountains.

The high ranges of the Mackenzie mountains on their astern side along the Grarel river, are auccreded, 50 miles vomthe Mackenzie river, by à belt of foothills about 3,000 etin height abore sea-lerel. Eastica rd the foothills dectine

inheight and ji nallu terminate in a broken, twooded plain,

nordering the Mackenzie rer, trith an eclevation of about

600 fret above seut-lerel,

enthe lower portions of loss and Pelly rirers, is once of