Trinity Group (geologic formation)
| Trinity Group Stratigraphic range: late Aptian-early Albian, 115–106 Ma | |
|---|---|
| Type | Group |
| Sub-units | |
| Underlies | Fredericksburg sands |
| Location | |
| Region | Texas, Arkansas |
| Country | United States |
The Trinity Group is a group (sequence of rock strata) in the Lower Cretaceous lithostratigraphy of Texas, Arkansas, Mississippi, New Mexico, Louisiana and Oklahoma.[1] It is named for the Trinity River of Texas.
A stratigraphic column at the Mount Bonnell Fault location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group. Upper Cretaceous formations follow, starting with the Del Rio Clay, Buda Limestone, and then the Eagle Ford Group. Formations within the Trinity Group include the Hammett Formation, Cow Creek Formation, Hensel Formation, and Lower and Upper Glen Rose Formation. The Hammett and the lower portion of the Upper Glen Rose act as confining units (or aquitard) for the Middle Trinity Aquifer. The Upper Glen Rose contains the Upper Trinity Aquifer, which appears to have intra-aquifer groundwater flow with the Edwards Aquifer as water levels are at the same elevation.[2]
Vertebrate fauna
Crocodylomorphs
| Crocodylomorphs reported from the Trinity Group | |||||
|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes |
|
P. trinquei |
Glen Rose Formation |
A neosuchian related to Eusuchia. Had procoelous vertebrae. | |||
|
P. newmani |
Twin Mountains Formation |
A neosuchian related to Eusuchia | |||
Dinosaurs
| Dinosaurs reported from the Trinity Group | |||||
|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes |
|
A. atokensis[5] |
Twin Mountains Formation |
||||
|
A. slaughteri |
Paluxy Formation |
A member of Somphospondyli | |||
|
C. weiskopfae |
Paluxy Formation |
||||
|
P. jonesi |
Twin Mountains Formation |
Junior synonym of Sauroposeidon proteles | |||
|
S. proteles |
Twin Mountains Formation |
A member of Somphospondyli | |||
|
T. dossi[8] |
Twin Mountains Formation |
An iguanodont | |||
|
Unnamed ornithopod[9] |
Twin Mountains Formation |
A basal ornithopod | |||
Pterosaurs
| Pterosaurs reported from the Trinity Group | |||||
|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes |
|
R. langstoni |
Glen Rose Formation |
An azhdarchoid pterosaur | |||
References
- ↑ "Geologic Unit: Trinity". National Geologic Map Database. USGS. Retrieved 31 May 2014.
- ↑ Saribudak, Mustafa (September 2016). "Geophysical mapping of Mount Bonnell fault of Balcones fault zone and its implications on Trinity-Edwards Aquifer interconnection, central Texas, USA". The Leading Edge. Society of Exploration Geophysicists. 35 (9): 752–758. doi:10.1190/tle35090752.1. Retrieved 12 September 2016.
- ↑ Rogers, Jack V., II (2003). "Pachycheilosuchus trinquei, a new procoelous crocodyliform from the Lower Cretaceous (Albian) Glen Rose Formation of Texas". Journal of Vertebrate Paleontology 23 (1): 128–145. doi:10.1671/0272-4634(2003)23[128:PTANPC]2.0.CO;2.
- ↑ Adams, T. L. (2013). "A new neosuchian crocodyliform from the Lower Cretaceous (late Aptian) Twin Mountains Formation of North-Central Texas". Journal of Vertebrate Paleontology 33: 85–10. doi:10.1080/02724634.2012.713277. edit
- ↑ Harris, J. D. 1998. A reanalysis of Acrocanthosaurus atokensis, its phylogenetic status, and paleobiogeographic implications, based on a new specimen from Texas. New Mexico Museum of Natural History and Science, Bulletin 13: 1-75.
- 1 2 3 D'Emic, M. D. 2013. Revision of the sauropod dinosaurs of the Early Cretaceous Trinity Group, southern USA, with the description of a new genus. Journal of Systematic Palaeontology, 11:707-726.
- 1 2 Rose, P. J., 2007. A new titanosauriform sauropod (Dinosauria: Saurischia) from the Early Cretaceous of Central Texas and its phylogenetic relationships. Palaeontologia Electronica Vol. 10, Issue 2; 8A:65p, 2.6MB; http://palaeo-electronica.org/paleo/2007_2/00063/index.html (PDF: 65 pages)
- ↑ Winkler, D., P. A. Murry, and L. L. Jacobs. 1997. A new species of Tenontosaurus (Dinosauria, Ornithopoda) from the early Cretaceous of Texas. Journal of Vertebrate Paleontology, 17:330-348.
- ↑ Winkler, D. and P. A. Murry. 1989. Paleoecology and hypsilophodontid behavior at the Proctor Lake dinosaur locality (early Cretaceous) Texas. Geological Society of America, Special Paper 238:55-61.
- ↑ Andres, B.; Myers, T. S. (2013). "Lone Star Pterosaurs". Earth and Environmental Science Transactions of the Royal Society of Edinburgh: 1. doi:10.1017/S1755691013000303. edit