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The Twin Mountains Formation, also known as the Twin Mountain Formation, is a sedimentary rock formation, within the Trinity Group, found in Texas of the United States of America. It is a terrestrial formation of Aptian age (Lower Cretaceous), and is notable for its dinosaur fossils. Dinosaurs from this formation include the large theropod ''Acrocanthosaurus'', the sauropod ''Sauroposeidon'', and the ornithopod ''Tenontosaurus''. It is the lowermost unit of the lower Cretaceous, lying unconformably on Carboniferous strata. It is overlain by the Glen Rose Formation. It is the lateral equivalent of the lower part of the Antlers Formation. ==Paleobiota== * ''Acrocanthosaurus atokensis''〔Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 553-556. ISBN 0-520-24209-2.〕 * Dromaeosauridae indet.〔 * Theropoda indet.〔 * Sauropoda indet.〔 * ''Sauroposeidon''〔 * Unnamed Euornithopod〔 * ''Tenontosaurus'' dossi〔 - "Skull and postcranial skeleton, several individuals."〔"Table 19.1," in Weishampel, et al. (2004). Page 414.〕 * Iguanodontia indet.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Twin Mountains Formation」の詳細全文を読む スポンサード リンク
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