Download British Columbia: A Natural History of Its Origins, Ecology, by Richard Cannings, Sydney Cannings PDF

By Richard Cannings, Sydney Cannings

This revised and accelerated version of an award-winning publication not just explores British Columbia's gorgeous ecology but in addition gains an elevated specialize in weather swap. With extended sections at the province’s geological heritage, up-to-date info at the mountain pine beetle and the way forward for B.C.’s biodiversity, and clean details on many different themes, this variation comprises new illustrations, photographs, sidebars, and new and revised maps.

Both an authoritative reference and an easy-to-read consultant, this revised version is a needs to for somebody who desires specific and up to date information regarding British Columbia’s marvelous usual world.

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Extra info for British Columbia: A Natural History of Its Origins, Ecology, and Diversity with a New Look at Climate Change

Sample text

Geology of the Cordilleran Orogen in Canada, Figs. 6. ALBERTA ALASKA two hundred million years of plate movement, mountain building, relaxation of the crust, volcanic eruptions and earthquakes has created the diverse landscapes of British Columbia. Map 11 shows the six major regions formed by all of this geological activity. WASHIN GTON PAC I F I C 0 100 kilometres 0 100 miles OCEAN 40 the sculpting of british columbia: glaciation IDAHO MONTANA British Columbia: A Natural History After 200 million years of building and shaping by tectonic movements and water erosion, the stage was set for the sculpting of British Columbia.

As dinosaurs strolled along the calm oxbow ponds beside the rivers, they left footprints in the undisturbed mud. Soon floodwaters brought more silt that covered the tracks. For ten thousand to fifteen thousand years, about 4 centimetres of sediments were laid down every year, and many generations of dinosaurs left signs of their daily activities in layer after layer of mud, silt and sand. These layers, buried under the growing Rocky Mountains, were eventually compressed into sedimentary rocks. Millions of years later, the Peace River cut through these layers of rock and revealed the tracks of its long-vanished fauna.

By 10 million years ago, they were so low that there was no rainshadow behind them; the Interior was cloaked in lush vegetation. Then, beginning 5 million years ago, the subduction zone of the Juan de Fuca and Explorer Plates steepened, bringing the subterranean mass of molten rock that had created the Pemberton Volcanic Belt directly beneath the huge batholithic belt created by the collision of Wrangellia millions of years earlier. In the south, this change gave birth to the Cascade Volcanic Arc, a series of impressive volcanoes that range from California’s Mount Shasta in the south to Mount Garibaldi and Mount Meager in the north.

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