| 词条 | Twin Mountains Formation |
| 释义 |
| name = Twin Mountains Formation | image = | caption = | type = Geological formation | age = Aptian | period = Aptian | prilithology = | otherlithology = | namedfor = | namedby = | region = Texas | country = {{USA}} | coordinates = | unitof = Trinity Group | subunits = | underlies = Glen Rose Formation | overlies = | thickness = {{convert|150|ft|m|abbr=on}} | extent = | area = | map = | map_caption = }} 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, as well as the ornithopods Tenontosaurus and Convolosaurus.[1] [2] 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.[3]Paleobiota
References{{Portal|Dinosaurs|Cretaceous|Texas}}1. ^{{cite book |last=Weishampel |first=David B. |authorlink=David B. Weishampe |author2=Barrett, Paul M. |author3=Coria, Rodolfo A. |author4=Le Loueff, Jean |author5=Xu Xing |author6=Zhao Xijin |author7=Sahni, Ashok |author8=Gomani, Elizabeth M.P. |author9=Noto, Christopher N. |editor=Weishampel, David B. |editor2=Dodson, Peter |editor3=Osmólska, Halszka |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 }} {{coord missing|Texas}}{{Texas-geologic-formation-stub}}2. ^{{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 }} 3. ^{{cite web | url=http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_10690.html | title=Geologic Unit: Twin Mountains | publisher=USGS | work=National Geologic Map Database | accessdate=31 May 2014}} 4. ^1 2 3 4 5 6 7 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}}. 5. ^"Table 19.1," in Weishampel, et al. (2004). Page 414. 6 : Geologic formations of Texas|Aptian Stage|Cretaceous geology of Texas|Early Cretaceous North America|Paleontology in Texas|Central Texas geography stubs |
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