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As such, the Wheeler Shale also represents a Konservat-Lagerstätten. [4] Together with the Marjum Formation and lower Weeks Formation, the Wheeler Shale forms 490 to 610 m (1,610 to 2,000 ft) of limestone and shale exposed in one of the thickest, most fossiliferous and best exposed sequences of Middle Cambrian rocks in North America. [5]
Burgess Shale Formation (Stephen Formation) Middle Cambrian: shale: marine Cadomin Formation: Early Cretaceous: Barremian to Aptian: conglomerate, sandstone: nonmarine Cairn Formation: Late Devonian: Frasnian: calcareous dolomite: marine Cardium Formation (Colorado Group) Late Cretaceous: Turonian to Coniacian: sandstone, siltstone: marine ...
The Burgess Shale is a fossil-bearing deposit exposed in the Canadian Rockies of British Columbia, Canada. [ 2 ] [ 3 ] It is famous for the exceptional preservation of the soft parts of its fossils. At 508 million years old ( middle Cambrian ), [ 4 ] it is one of the earliest fossil beds containing soft-part imprints.
Perspicaris (from the Latin perspicax, meaning “sharp-sighted,” and caris, “crab/shrimp”) an extinct genus of bivalved arthropod from the Cambrian period. Fossils have been found in North America, primarily the Burgess Shale of British Columbia, Canada but also possibly the Wheeler Shale, Marjum Formation, Pioche Shale and Bloomington Formation.
The Blairmore Group reaches up to 2,500 feet (760 meters) thick, divided into the Gladstone Formation conglomerate, sandstone, green shale and non-marine red shale, the Beaver Mines Formation with shale and chlorite sandstone and the Mill Creek Formation with pyroclastic flow sediments, related to Mesozoic volcanism in the Canadian Rockies.
The shale would have supported unique environments like brine pools that could have also helped to preserve the fossils. Notable areas that expose the Burgess Shale include the Walcott Quarry, Marble Canyon, Stephen Formation, Tulip beds, Stanley Glacier, the Trilobite Beds and the Cathedral Formation. With each site occupying a varying depth ...
Sully Formation: early to Late Cretaceous: marine shale and siltstone: 300 m (980 ft) [13] Sikanni Formation: early Cretaceous: fine-grained, calcareous, glauconitic sandstone, argillaceous siltstone and shale: 240 m (790 ft) [14] Lepine Formation* middle to late Albian: silty mudstone, sideritic concretions: 900 m (2,950 ft) [15] Scatter ...
The Stephen Formation is a geologic formation exposed in the Canadian Rockies of British Columbia and Alberta, on the western edge of the Western Canada Sedimentary Basin.It consists of shale, thin-bedded limestone, and siltstone that was deposited during Middle Cambrian time (513 to 497 million years ago). [5]