By Rolf Ludvigsen
Life in Stone is the 1st booik to target British Columbia’s fossils. every one of its chapters is written by means of a consultant for a normal viewers, and every is dedicated to a separte fossil workforce that's relatively good represented within the province.
British Columbia is an unlimited storehouse of fossils, a lot of which date again one thousand million years. millions of exposures of sedimentary rocks through the province comprise fossil shells, scales, bones, tooth, and leaves. a number of the fossils are huge and amazing, between them the bones of mammals and reptiles, complete ammonoids, and whole fishes and fern fronts. yet even a small fossil akin to a typical shell, a plant fragment, or a little bit bone turns into a distinct icon as soon as its nature and age are made clear.
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Extra resources for Life in Stone: A Natural History of British Columbia's Fossils
Stikinia Upper Paleozoic to Lower Jurassic volcanic and sedimentary rocks and granitic intrusions. Permian, Triassic, and Jurassic faunas are similar to those in the western United States. Wrangellia Upper Paleozoic to Lower Jurassic volcanic rocks, granite, limestone, sandstone, and argillite. Paleomagnetic data from Triassic and Jurassic strata indicate origin from the latitude of the western United States. that time the margin of the continent has been built 700 kilometres oceanward, mainly by the incremental addition of terranes to the old continental margin.
Determining paleolatitudes involves measuring the inclination of the magnetic field preserved in a rock, for example, the field frozen into a lava flow as it cooled. We know that the present magnetic field is vertical at the poles, horizontal at the equator, and inclined in between. We also know that flows of lava cool as horizontal layers. Paleolatitudes are established by measuring the angle of the magnetic field and comparing it to the ancient horizontal plane. Paleomagnetic measurements like these show that the original latitudes of some rocks in the central and western Cordillera differ from those of the continental interior.
M. 1881. Sketch of the Geology of British Columbia. Geological Magazine. New Series 8:156-62, 214-27 Francheteau, J. 1983. The Oceanic Crust. , and CJ. Yorath, eds. 1991. Geology of the Cordilleran Orogen in Canada. Geological Survey of Canada, Geology of Canada, No. H. , A. Cox, P. Coney, and M. Beck. 1982. The Growth of Western North America. J. Silberling, and J. Hillhouse. 1977. Wrangellia - A Displaced Terrane in Northwestern North America. A. Price, and DJ. Tempelman-Kluit. 1982. Tectonic Accretion and the Origin of the Two Major Metamorphic and Plutonic Welts in the Canadian Cordillera.
Life in Stone: A Natural History of British Columbia's Fossils by Rolf Ludvigsen