ORIES

’ Mountain &yjate ss ctrcel lire t masi con veictt} 4 #00 miles, measured along the Ma illan «vit

P rer They extend jor about 700 mies north

: t rom Liard river almost to l'oreupine rire The

scie aralerm han renulted fre long conti at tiffer

P ! rosion Gcting où un mpliftecd l ,

“tree none sented by à complicated group 0j canular masses + umeroux peuka rising to hrights of between 6200

{ 5100 Jet above ae level

East of Mount Sekori, on Grarel river, the mountains in form, #ructure and colour [rom those to the west of thot point The testern portion of the nuatem has born ’ ted to long continue érosion, the ralls ys are vite forest covered salopes rising in eus Curtes, and the

} r peaks are set well back jrom the vaut y bhottoums in

! stern portion the mountains are cridently in a more

fut topographie stage; they re more massive and

d, and the drainage channels are fine in mar

, shating steep, barren or partly wouded slopes of rock

‘ alus

he region Tying west 6[f the Mackenzie mountaina

between the lover portions of Hoss and Polly river, ia one of

tapareativelog lost relief, the halls havine ni General cleveat it

out 5,000 jet ubove sea-lervel or 0f 2,090 feet above the levels of the principal rivers. The region is characterized »w ny, Gently slopinug, ivregular Hills covered almost to

reir summite with thire grottth of small spruce and balsem

and the main rivers and their chief tributaries oceupy

crtousice, tell ereloped valleys. These valley have fatrly lerel fours, often several miles in width, ant contain LIPT ET?) small lakes and ponda, also extensive benver meudorws

nd groves 6[ good sprucer This type of country oct upies

boit ertending southeasterly jromtne L'elly monuntains, tan

isolated, high group}, to the Mackenzie mountains

The high ranges of the Macke te mountiains on their

tern side along the Gravel viver, are succeeded, 530 miles

mthe Mackenzie river, by «a belt cf foothills about 900

tin height ahoveseu-lerel. Eustward the foothilla decline

‘height and finally terminate in à broken, wooded plain, ring the Mackensie river, with an eleration of about

“ut et above sealevel

tester

lopes vf the Mackenzie mountains are the

Mhering ground of numerous stream that flo into th lelly, Maemillan and Ross rivers, tributaries of the Yukon ft. portion of the drainage of the trestern alopes, in the

veu shown near the southern border of the mup, falts into Frances river which joins the Liard, à tributary of the Mackenzie, The drainage of the rastern ones of the aryatem

received by the Mackenzie river. On the iestern salopes, “here the precipitation is hrary, the ctreams meander through wide, well developed ratleys having easy grades,

Onthe caxtern side, where the precipitation is light, the

drainage channels are contracted and are confined in narrone valleys tith steep grades, 0, »