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The Sundance Formation is a western North American sequence of Middle Jurassic to Upper Jurassic age [1] Dating from the Bathonian to the Oxfordian, around 168-157 Ma, It is up to 100 metres thick [2] and consists of marine shale, sandy shale, sandstone, and limestone deposited in the Sundance Sea, an inland sea that covered large parts of western North America during the Middle and early Late ...
The Sundance Sea was an epeiric sea that existed in North America during the mid-to-late Jurassic Period of the Mesozoic Era. [1] It was an arm of what is now the Arctic Ocean , and extended through what is now western Canada into the central western United States.
Three geological formations, the Sundance, the Morrison, and the Cloverly Formations, containing fossil remains from the Late Jurassic of the Mesozoic Era are exposed. Nineteenth-century paleontologists discovered many well-preserved specimens of dinosaurs, as well as mammals, turtles, crocodilians, and fish from the Morrison Formation.
The earliest phase of the seaway began in the mid-Cretaceous when an arm of the Arctic Ocean transgressed south over western North America; this formed the Mowry Sea, so named for the Mowry Shale, an organic-rich rock formation. [1] In the south, the Gulf of Mexico was originally an extension of the Tethys Ocean. In time, the southern embayment ...
Fish from the formation are represented by hybodont [21] and neoselachian chondrichthyans as well as teleosts (including Pholidophorus). Marine reptiles are uncommon, but are represented by four species. [18] Of all the plesiosaurs, Megalneusaurus is the only pliosaurid identified in the Sundance Formation.
Tatenectes is a genus of cryptoclidid plesiosaur known from the Upper Jurassic of Wyoming.Its remains were recovered from the Redwater Shale Member of the Sundance Formation, and initially described as a new species of Cimoliosaurus by Wilbur Clinton Knight in 1900.
More recently, in 1977, Terry Logue reported possible fossil pterosaur footprints from the Sundance Formation in Wyoming. [8] Later, on 18 February 1987 the Eocene fish Knightia was designated the Wyoming state fossil. In 1994 Triceratops was designated the state dinosaur of Wyoming.
Sundance Formation; Sundance Sea; T. Twin Creek Formation; Twin Creek Limestone This page was last edited on 16 January 2018, at 03:54 (UTC). Text is available ...