![]() These include work carried out by George Mercer Dawson in 1890 as part of his survey of British Columbia for the Geological Survey of Canada, with occasional research published in the 1920s and 1930s. Palaeontological and geological studies of these deposits go back about 130 years. ![]() Many of these warm-climate plants are today only found in southern China. It combined a warm temperate upland climate with mixtures of plants of temperate deciduous and coniferous forests together with those normally associated with subtropical forests, such as the Chinese eucommia, golden larch, and golden raintree. This ancient environment was similar in many respects to present-day deciduous forests of the US southeast. Swarms of mayflies, scorpionflies (Mecoptera), green lacewings (Neuroptera), fungus gnats, and a myriad of other insects filled the air at a diversity normally expected in tropical forests. The floating fern Azolla covered quiet parts of the lakes, under which swam ancient salmon and other fish. ![]() The Okanagan Highlands in the early Eocene were home to mixed forests of conifers such as cedars, fir, hemlock, pine, spruce, and redwoods, and deciduous trees and shrubs such as alder and birch, cherry, elm, maple, beech, sassafras and sweetfern, together with ginkgo and rare palms and cycads. In the interior from near Princeton north to Smithers, however, at an elevation of about 0.5-1.2 km, there was a cooler upland region called the Okanagan Highlands, where volcanic activity had created numerous lakes. Some 50 to 55 million years ago, during the early Eocene Epoch, British Columbia had a subtropical climate.
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