April 12, 2024
WEEKS Formation trilobite - Ultra rare Meteoraspis dis
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Name: Meteoraspis dis Class Trilobita; Order: Ptychopariida; Suborder Ptychopariina; Family Yunnannocephalidae Age : Upper Cambrian Size: 3,9 cm long x 2,4 cm wide; Matrix: 8 cm x 9 cm. Very good and complete specimen, with no restaurations. Found in the June 2007. Fossil Site: Weeks Formation, Millard County, Utha. Western Utah is one of the best-known Cambrian fossil localities in the world. The Wheeler Shale and Marjum Formation, strata of Middle Cambrian age, exhibit various exposures throughout the House Range and nearby mountain ranges west of the town of Delta, Utah. The Wheeler Shale is named for a major feature in the House Range, the Wheeler Amphitheater. The Wheeler Shale contains interbeds of shaley limestone, mudstone, and thin platy limestone. Much of the Wheeler Shale is not particularly fossiliferous, but certain layers contain abundant trilobites and other shelly fossils. The Wheeler Shale also is known for a diverse biota of soft-bodied fossils, including many of the same taxa found in the Burgess Shale. In the Cambrian, the continent of Laurentia (now the majority of North America), was equatorial, and oriented about ninety degrees from its current position. Close to the shorelines of Laurentia, limestone was deposited as shallow-ater reefs. Beyond the limestone belt, fine sediments built in deeper offshore
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