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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]
The Marjum Formation is a Cambrian geological formation that overlies the Wheeler Shale in the House Range, Utah. [ 1 ] [ 3 ] It is named after its type locality, Marjum Pass, and was defined in 1908. [ 2 ]
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A Burgess Shale-type biota coeval in age with the more famous Wheeler Shale and Marjum Formation. [51] Wheeler Shale (House Range) 504 Ma Western Utah, US A world-famous locality known for its prolific agnostid and Elrathia kingii trilobite remains. Varied soft bodied organisms are also locally preserved, including Naraoia, Wiwaxia and ...
Geological formations consist of rock that was deposited during a specific period of time. They usually extend for large areas, and sometimes there are different important sites in which the same formation is exposed. Such sites may have separate entries if they are considered to be more notable than the formation as a whole.
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.
Elrathia kingii growth series with holaspids ranging from 16.2 mm to 39.8 mm in length. Elrathia is a genus of trilobite belonging to Ptychopariacea known from the mid-Cambrian of Laurentia (North America). [2]
Asaphiscus wheeleri, 37 mm long. Asaphiscus are average size trilobites of (up to 8 centimetres or 3.1 inches) with a rather flat calcified dorsal exoskeleton of inverted egg-shaped outline, about 1 + 1 ⁄ 2 × longer than wide, with the widest point near the back of the headshield (or cephalon).