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

Pachycheilosuchus[3]

P. trinquei

Glen Rose Formation

A neosuchian related to Eusuchia. Had procoelous vertebrae.

Paluxysuchus[4]

P. newmani

Twin Mountains Formation

A neosuchian related to Eusuchia

Dinosaurs

Dinosaurs reported from the Trinity Group
Genus Species Location Stratigraphic position Material Notes

Acrocanthosaurus

A. atokensis[5]

Twin Mountains Formation

A carcharodontosaurid

Astrophocaudia[6]

A. slaughteri

Paluxy Formation

A member of Somphospondyli

Cedarosaurus[6]

C. weiskopfae

Paluxy Formation

A brachiosaurid

Paluxysaurus[7]

P. jonesi

Twin Mountains Formation

Junior synonym of Sauroposeidon proteles

Sauroposeidon[6][7]

S. proteles

Twin Mountains Formation

A member of Somphospondyli

Tenontosaurus

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

Radiodactylus[10]

R. langstoni

Glen Rose Formation

An azhdarchoid pterosaur

References

  1. ↑ "Geologic Unit: Trinity". National Geologic Map Database. USGS. Retrieved 31 May 2014.
  2. ↑ 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.
  3. ↑ 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.
  4. ↑ 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
  5. ↑ 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.
  6. 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.
  7. 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)
  8. ↑ 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.
  9. ↑ 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.
  10. ↑ 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

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