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British Columbia geology. The rock formations of British Columbia range in age from the Precambrian to recent.
Some lava flows are only a few hundred years old.
The Precambrian era rocks, chiefly sedimentary, occur in the southeast part of the province.
An extensive belt of metamorphic rock, schists and gneisses of undetermined age underlies the eastern part of the Interior Plateau and parts of the Monashee, Selkirk, Cariboo and Omineca Mountains.
Palaeozoic rocks form the main ranges of the Rocky Mountains. They underlie much of the country along and west of the Rocky Mountain Trench.
Late Palaeozoic era sedimentary and volcanic rocks are exposed in a narrow belt extending northward along the Fraser River to the Omineca Mountains.
Similar rocks occur in the northwest, between Atlin and Teslin Lakes.
Rocks of the Mesozoic age are widespread.
Sedimentary and volcanic formations occur throughout the central part of the province between the Coast Mountains and the Rocky Mountain Trench, and on Vancouver and Queen Charlotte Islands.
Mesozoic stratified sedimentary rocks, mainly Cretaceous in age, occur east of the Rocky Mountain Foothills and along the east coast of Vancouver Island.
Granatic intrusions, ranging from small plutons to large composite batholiths of Mesozoic and Early Tertiary age, are widespread.
They intrude older rocks in a belt corresponding to the Coast Mountains, in another belt corresponding to the Omineca-Cassiar Mountains, and in an area extending across the southern part of the province between the Fraser River and Kootenay Lake.
Tertiary rocks, mostly lava flows and associated volcanics, overlie older formations in the Interior Plateau, Stikine Plateau, and on Graham Island.
Mineral deposits are widespread throughout the province with copper forming the greatest number.
It occurs as massive sulphide deposits in the Coast and Insular belts, in porphyries in the Interior belt, and in widely distributed skarn deposits.
Copper, molybdenum and tungsten are associated in porphyry deposits in the Interior.
Lead-zinc mineralization occurs as stratiform deposits in the late Precambrian and Cambrian rocks of southeastern British Columbia.
Silver and silverlead-zinc veins are localized in the Slocan area. Iron, as magnetite, occurs mainly in skarns in the Insular belt or associated with porphyry copper in the Interior belt.
Gold is widely dispersed in veins and as an accessory in other classes of deposits throughout all mineralized regions.
Significant quantities of oil and gas occur in the Palaeozoic and Mesozoic formations east of the Rocky Mountains in the northeastern part of the province.
Some petroleum exploration and drilling activity has been undertaken on the continental shelf west of Vancouver Island and in Hecate Strait, and in various parts of the Interior, Vancouver Island and the Lower Fraser Valley, but no commercial discoveries have been made to date west of the Rockies.
Extensive coal reserves are present in Cretaceous rocks of the Rocky Mountains, in isolated coal basins in central British Columbia and along the east coast of Vancouver Island.
More information: Ministry of Sustainable Resource Management - Resource Management Division
lakes, planning area, forests, land, community, Burns Lake, resources, construction, lakes district, ecosection, uplands, spruce, Babine, valley, Nechako.
The Lakes District Land and Resource Management planning area encompasses 1.58 million hectares of land in the north central interior of British Columbia.
Ecosection representation has been a key consideration in assessing areas for protected area status.
Because of frequent wildfires in the past, there is a mosaic of forest ages, and old forests are relatively uncommon, except at higher elevations.
Almost 30% of the annual timber harvest from the Lakes District now flows to mills outside of the district.
It holds promise as a model for future co-operation with aboriginal peoples in identification of land and resource management concerns at the strategic planning level.
Forest, Range & Recreation Resource Analysis 1994 http://www.for.gov.bc.ca/hfd/library/frra/1994/chap2.htm
mountains, soils, British Columbia, climates, plateaus, glaciation, interior, plains, organisms, coast, forest, slopes, drift, dominate, islands. Mountains feature prominently in the geography, environment and culture of British Columbia; so too does the sea coast, which is intricate and fringed with islands throughout its length.
It has extensive plateaus, plains and basins as well as several roughly parallel series of mountains.
All nine main groups of soils found in Canada occur in British Columbia.
The terrain of the Coast and Cascade mountains is typical of intrusive igneous rocks that have undergone mountain glaciation.
The wettest climates of British Columbia (and Canada) occur along B.C.'s coastline, especially near the mountains on windward slopes of Vancouver Island, the Queen Charlotte Islands and the mainland Coast Mountains.
rocks, shield, mountain, sediments, Canadian Shield, deposits, North America, landscape, ancient, zone, platform rocks, southern Ontario, mountain building, Lecture, geology.
There are three major structural elements to the Canadian landscape (illustrated in Fig. 3-1) are: - the Precambrian Canadian Shield in its various provinces (not to be confused with the political entities) - the platform rocks, mainly Palaeozoic that lie over the edges of the Shield, and - the mountain or orogenic belts around the western, eastern and northern edges of the country.
A few minor tectonic events occurred, such as the doming of rocks northwest of Hudson Bay and the rifting of Greenland from North America (about 55 million years ago), and oceans of the Phanerozoic Eon covered it at various times leaving their sediments.
Cordilleran, belt, tectonism, continuity, crust, seismic-velocity, orogens, zones, craton, evidence, basin, faults, metamorphism, rocks, Rocky Mountain.
the main differences between major tectonic zones in the Cordilleran interior lie not in their assumed exotic-terrane composition but in the degree and history of in situ, multi-aspect, multicycle orogenic reworking of the indigenous, ex-cratonic North American lithosphere and crust.
External plate-boundary influences (subduction, terrane collisions etc.) are not necessary to explain all intra-continental tectonism.
On trend with the Proterozoic Athabasca Basin and the much-inverted latest Proterozoic-Phanerozoic Peace River Arch in the craton, the prominent NE-SW-trending Skeena Arch in the Cordilleran interior has been active since at least the Mesozoic, dividing the Intermontane Belt into major crustal blocks and forming the southern boundary of the Bowser Basin.