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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 ...
Fossils may be found either associated with a geological formation or at a single geographic site. 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.
Fossils from the Harrison Formation and Anderson Ranch Formation, which date to the Arikareean in the North American land mammal classification, about 20 to 16.3 million years ago, are among some of the best specimens of Miocene mammals. [6] Species found in Agate include: Miohippus, Merychippus and Parahippus, ancestors of the modern day horse.
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.
All known specimens of Tatenectes come from the Redwater Shale Member in the upper part of the Sundance Formation. This formation is located in Wyoming, in the Eastern Rocky Mountains. An incomplete plesiosaur skeleton preserving multitudinous vertebrae and a nearly complete forelimb from the Sundance Formation was described by Wilbur C. Knight ...
Fish from the formation are represented by hybodont [24] and neoselachian chondrichthyans as well as teleosts (including Pholidophorus). Marine reptiles are uncommon, but are represented by four species. [21] Of all the plesiosaurs, Megalneusaurus is the only pliosaurid identified in the Sundance Formation.
Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...
The holotype YPM 543 is a partial articulated skeleton, partially prepared to yield a distal humerus, four articulated carpals, a fragment of the coracoid, and several isolated cervical vertebrae from the Upper Member of the Sundance Formation. Other material includes USNM 536963, USNM 536965, UW 3, UW 5544 and UW 15938. [4]
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