O

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4. ORAINACE SYSTEMS

THe CassiArR MOUNTAINS ARE IN THE CENTRE OF THREE MAIN DRAINAGE

SYSTEMS:

1) Tue STIKINE RIVER ano ITs TRIBUTARIES, THE TuyA, TANZILLA,
PITMAN AND KLAPPAN RIVERS, FLOWING WEST THROUGH TELECRAPH CREEK

TO THE SEA.

2) Tue LIARD RIVER ano tTs TRIBUTARIES, THE RancHerta, DEASE,

TURNAGAIN AND KECHIKA RIVERS, FLOWING EAST TO THE MACKENZIE.

°3) © Tue TESLIN RIVER AND ITS TRIBUTARIES, THE KepAHDA, JENNINGS AND

SwiFT RIVERS, FLOWING NORTH INTO THE YUKON RIVER SYSTEM.

5, RELIEF

IN GENERAL, ALL MOUNTAIN RANGES FOLLOW THE REGIONAL
NORTHWESTERLY CoRDILLERAN TRENO. MOST OF THEM ARE AT THE STAGE sie indies
MUM RELIEF, WITH SHARP, KNIFE-EOCED, SERRATED RIDGES AND VERY STEEP UPPER
SLOPES, FLATTENING RAPIDLY DOWNWARD INTO THE BROAD VALLEY BOTTOMS
CHARACTERISTIC OF GLACIATED TERPAIN. SOME OF THE RANGES ARE JUST PAST
THE STAGE OF MAXIMUM RELIEF AND THICK DEPOSITS OF TALUS, KNOWN AS
VFELSENMEER", ARE ACCUMULATING ON THEIR FLANKS, OBSCURING SOME OF THE
GEOLOGICAL FEATURES. LOWLAND ELEVATIONS RANGE FROM ABOUT 2,000 FEET IN
THE LiArp PLAIN +» 4,000 FEET ON THE STIKING PLATEAU, WHILE THE SUMMITS |

IN THE CASSIAR MOUNTAINS ARE GENERALLY ABOUT 6,500 FEET, WITH SOME OVER

7,000 Feet. THE HIGHEST POINT IN THE McDame Rance ts 7,000 reer.