Twin Mountains Formation

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 "Paluxysaurus", and the ornithopod "Tenontosaurus".cite book |last=Weishampel |first=David B. |authorlink=David B. Weishampel |coauthors=Barrett, Paul M.; Coria, Rodolfo A.; Le Loueff, Jean; Xu Xing; Zhao Xijin; Sahni, Ashok; Gomani, Elizabeth M.P.; and Noto, Christopher N. |editor=Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.)|title=The Dinosauria |edition=2nd |year= 2004|publisher=University of California Press |location=Berkeley |isbn=0-520-24209-2 |pages=517-606 |chapter=Dinosaur distribution ] cite journal |last=Rose |first=Peter J. |year=2007 |title=A new titanosauriform sauropod (Dinosauria: Saurischia) from the Early Cretaceous of central Texas and its phylogenetic relationships |journal=Palaeontologia Electronica |volume=10 |issue=2 |url=http://palaeo-electronica.org/2007_2/00063/ |format=web pages ]

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