The Cassiar Mountains
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1 The Cassiar Mountains
2 Introduction
3
4
5 Topography
6 Dease Plateau Dease Lake, BC
7 Stikine Ranges Eve Cone Mount Edziza Provincial Park Mount Ash, BC 2 125m
8 Ketchika Ranges Muskwa- Ketchika Management Area
9 Sifton Ranges Sentinel Range, BC
10 Weather and Climate
11 Physiographic Regions
12 Mean Annual Temperature
13 January Mean Temperature July Mean Temperature
14 Mean Annual Precipitation
15 Mean Annual Snowfall
16 Dease Lake
17 Watson Lake
18 Hydrology
19 Ocean Drainage Basins of Canada
20 Glacial Influence on British Columbian Rivers
21 Monthly River Discharge
22 Geology
23 Formation of the Cassiar Mountains Collision of the Intermontane Superterrane and the North American continental plate The rocks of the Superterrane were squeezed and compressed to form the Cassiar Mountains
24 Mineral Exploration Asbestos Mining in Cassiar Nephrite Jade Mine Numerous gold exploration projects ongoing in the Dease Lake Region
25 Cassiar, BC The town closed in 1992 after the asbestos mine ceased operation after operating since the early 1950s.
26 Jade City, BC Dynasty mine produces approximately 90% of the world s jade Nephrite jade is a type of actinolite amphibole
27 Dease Lake, BC Home to gold mining and prospecting since the Gold Rush Many exploration projects ongoing in the area
28 Geomorphology
29 Glacial Movement Glaciers flowed off of the mountain range in three directions: to the northeast into the Rocky Mountain Trench; to the southeast into the Trench South of Finlay River; and to the west over the lower plateaus and uplands
30 Geomorphic Features from Glaciation The landscape has been scoured by glacier creating U-shaped valleys and steep cliffs with lateral moraines. Common features: cirque basins, moraines, eskers, talus slopes Currently in the paraglacial stage
31 Fraser Glaciation The little chronological data found tells us that the Late Wisconsin Fraser Glaciation in Southern BC is comparable to Northern BC Evidence of polythermal glaciers Main source of ice was from the central névé over the Northern Skeena Mountains
32 Forest Fires and Geomorphic Impact 2010 a lightening strike caused a 35,000 hectare fire by the Cassiar Highway near the Yukon border Fires change sediment movement through watersheds by changing vegetation cover and soil properties Increased mass wasting (debris flows, debris avalanche, and rapid mudflows) results from forest fire impact on the landscape
33 Flora and Fauna
34 Stone sheep, mountain goats, caribou, grizzly and black bear, grey wolf, wolverine, arctic ground squirrel
35 Biogeoclimatic Zones 1) The Alpine Tundra Zone- highest elevations 2) Spruce-Willow-Birch Zone- subalpine elevations 3) Boreal White and Black Spruce Zone- lower elevations and valley bottoms
36 Biogeoclimatic Map of BC Dark brown= Alpine Tundra Yellow/green= Spruce-Willow-Birch Blue= Boreal White And Black Spruce
37 Alpine Tundra - Long, cold winters with a brief growing season - Vegetation grows close to the ground - Common species include: alpine grasses, dwarf willows and lichen
38 Spruce-Willow-Birch Zone Common species: white spruce, subalpine fur, Greyleaved willow, Barclay s willow, tea-leaved willow, and Barratt s willow Most severe weather of all forested areas in BC Lower elevations are forest and upper elevations are scrub/parkland
39 Boreal White and Black Spruce Zone 10% of BC s total area Wildfires occur frequently in this zone Divided into two regions: forested area and muskeg Forested area: white spruce, trembling aspen, lodgepole pine, black spruce, balsam poplar, tamarack, subalpine fir, common paper birch, and Alaska paper birch Muskeg: Trees that occur here are stunted black spruce and tamarak. There are deep layers of peat and permafrost found under the muskeg
40 End
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