Twin Mountains Formation
| Twin Mountains Formation Stratigraphic range: Early Cretaceous |
|
|---|---|
| Type | Geological formation |
| Unit of | Trinity Group |
| Underlies | Glen Rose Formation |
| Thickness | 150 ft (46 m) |
| Location | |
| Region | North America |
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.[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
- Acrocanthosaurus atokensis[4]
- Dromaeosauridae indet.[4]
- Theropoda indet.[4]
- Sauropoda indet.[4]
- Sauroposeidon[4]
- Unnamed Euornithopod[4]
- Tenontosaurus dossi[4] - "Skull and postcranial skeleton, several individuals."[5]
- Iguanodontia indet.[4]
References
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- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 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.
- ↑ "Table 19.1," in Weishampel, et al. (2004). Page 414.
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