Life in Stone: A Natural History of British Columbia's by Rolf Ludvigsen

By Rolf Ludvigsen

Life in Stone is the 1st booik to target British Columbia’s fossils. every one of its chapters is written via a expert for a common viewers, and every is dedicated to a separte fossil workforce that's quite good represented within the province.

British Columbia is an enormous storehouse of fossils, lots of which date again one thousand million years. millions of exposures of sedimentary rocks through the province include fossil shells, scales, bones, tooth, and leaves. many of the fossils are huge and remarkable, between them the bones of mammals and reptiles, whole ammonoids, and whole fishes and fern fronts. yet even a small fossil equivalent to a typical shell, a plant fragment, or a little bone turns into a different icon as soon as its nature and age are made clear.

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1 A). Evidence for Great Lateral Displacements The concept of mobility is implicit in the plate tectonic hypothesis. As might be expected from the location of the Canadian Cordillera on or near a plate boundary throughout Phanerozoic time, the Cordillera contains evidence that many rocks within it have moved great distances across the earth's surface. The geological structures called folds and faults record the stresses that were imposed on a rock after it formed and that changed its original shape.

A) Transform or strike-slip faults. These faults mostly moved late in the history of the Cordillera (Late Cretaceous-Holocene) and disrupted older features. (B) Thrust fault systems. In (1), the open barbs denote thrust faults within once-continuous stratigraphy, across which offsets can be measured. In (2), the open and solid barbs denote complex thrust faults that involve oceanic crust; some probably represent subduction zones involved in later thrusting. In (3), the solid barbs denote thrust faults that were, or are, subduction zones involving oceanic crust.

With a few minor exceptions, trilobites are the only fossils found with their eyes preserved, or rather, their lenses preserved. Trilobites are unique among Metazoa in having lenses that are composed of calcite. These conspicuous structures on the trilobite head are evidence of an unbelievably ancient visual system. Recognizing these structures as eyes, early paleontologists began to study these fossils not as curiosities but as extinct animals comparable to those now living. In 1840, Timothy Conrad, the first State Paleontologist of New York, wrote 'Ode to a Trilobite,' which includes these lines: The race of man shall perish but the eyes Of trilobites eternal be in stone, And seem to stare about with wild surprise At changes greater than they yet have known.

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