Aguja Formation

Aguja Formation Stratigraphic range: Upper Cretaceous
Type	Geological formation
Sub-units	Rattlesnake Mountain Sandstone
Underlies	Javelina Formation
Location
Country	USA and Mexico

The Aguja Formation is a geological formation in North America, exposed in Texas, whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.^[1]

Contents

1 Invertebrate paleofauna
- 1.1 Ammonites
2 Vertebrate paleofauna
3 See also
4 Footnotes
5 References

Invertebrate paleofauna

Ammonites

Ammonites of the Aguja Formation
Genus	Species	Location	Member	Abundance	Notes	Images
Baculites	B. mclearni		Rattlesnake Mountain Sandstone
Hoplitoplacenticeras	H. plasticum		Rattlesnake Mountain Sandstone
Pachydiscus	P. paulsoni		Rattlesnake Mountain Sandstone

Vertebrate paleofauna

Crurotarsans

Crurotarsans of the Aguja Formation
Genus	Species	Location	Member	Material	Notes	Images
Deinosuchus^[2]	D. riograndensis^[2]	Texas^[2]
Phobosuchus^[2]	P. riograndensis^[2]	Texas^[2]			Reclassified as a Deinosuchus species.

Ornithischians

Color key

Taxon	Reclassified taxon	Taxon falsely reported as present	Dubious taxon or junior synonym	Ichnotaxon	Ootaxon	Morphotaxon

Notes
Uncertain or tentative data are in small text; ~~crossed out~~ data are discredited.

Ornithischians of the Aguja Formation
Genus	Species	Location	Member	Material	Notes	Images
Agujaceratops^[3]	A. mariscalensis^[3]	Texas^[3]			The type species, A. mariscalensis, was formerly considered a species of Chasmosaurus.^[3]
Angulomastacator^[4]	A. daviesi^[4]	Texas^[4]
Chasmosaurus^[5]	C. mariscalensis^[6]	Texas^[6]		"[Twelve] disarticulated skull (sic), postcrania, juvenile."^[7]	Considered by paleontologists Lucas, Sullivan, and Hunt to be distinct enough from the Chasmosaurus type species, C. belli to warrant being split off to a new genus, Agujaceratops.^[3]
Chasmosaurus^[5]	Indeterminate^[8]	Chihuahua^[8]
Edmontonia^[6]	E. rugosidens^[9]	Texas^[6]
Euoplocephalus^[6]	Unnamed species^[6]	Texas^[6]
Gryposaurus^[10]	Indeterminate^[6]	Texas^[6]
Kritosaurus^[5]	K. navajovius^[11]	Texas^[6]
Kritosaurus^[5]	Indeterminate^[5]	Chihuahua^[12] ~~Texas~~^[6]			The Texan indeterminate Kritosaurus remains were later referred to Gryposaurus.^[6]
Panoplosaurus^[6]	Unnamed species^[6]	Texas^[6]
Stegoceras^[6]	Indeterminate^[6]	Texas^[6]
Texacephale^[13]	T. langstoni^[13]	Texas^[13]

Saurischians

Color key

Taxon	Reclassified taxon	Taxon falsely reported as present	Dubious taxon or junior synonym	Ichnotaxon	Ootaxon	Morphotaxon

Notes
Uncertain or tentative data are in small text; ~~crossed out~~ data are discredited.

Saurischians of the Aguja Formation
Genus	Species	Location	Member	Material	Notes	Images
Dromaeosaurus^[14]	Indeterminate^[14]	Texas^[6]
Ricardoestesia^[15]	R. gilmorei^[16]	Texas^[15]
Ricardoestesia^[15]	R. isosceles^[15]	Texas^[15]
Saurornitholestes^[6]	S. langstoni^[17]	Texas^[6]
Troodon^[18]	Indeterminate^[18]	Texas^[6]

Turtles

Testudines of the Aguja Formation
Genus	Species	Location	Member	Material	Notes
Terlinguachelys^[2]	T. fischbecki^[2]	Texas	Rattlesnake Mountain Sandstone^[2]

See also

List of dinosaur-bearing rock formations

Footnotes

	Earth sciences portal
	Paleontology portal
	Dinosaurs portal

^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ "Aguja Formation (Upper Shale Member), Big Bend Region, Texas," in Sullivan and Lucas (2006). Page 16.
^ ^a ^b ^c ^d ^e "Abstract," Lucas, Sullivan, and Hunt. (2006).
^ ^a ^b ^c Wagner and Lehman (2009).
^ ^a ^b ^c "Dinosaur distribution (Texas and Chihuahua)." Weishampel, et al. (2004). Page 582 and 588.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 582.
^ "Table 23.1," in Weishampel, et al. (2004). Page 496.
^ ^a ^b Listed as ?Chasmosaurus sp. in "Dinosaur distribution (Late Cretaceous; North America; Chihuahua)." Weishampel, et al. (2004). Page 588.
^ Listed as Edmontonia cf. rugosidens in "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 582.
^ Listed as ?Gryposaurus sp. in "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 582.
^ Listed as Kritosaurus cf. navajovius in "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 582.
^ "Dinosaur distribution (Late Cretaceous; North America; Chihuahua)." Weishampel, et al. (2004). Page 588.
^ ^a ^b ^c "Abstract," Longrich, Sankey, and Tanke (2010).
^ ^a ^b Listed as cf. Dromaeosaurus sp. in "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 582.
^ ^a ^b ^c ^d "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 581.
^ Listed as R. cf. gilmorei in "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 581.
^ Listed as Saurornitholestes cf. langstoni in "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 582.
^ ^a ^b Listed as cf. Troodon sp. in "Dinosaur distribution (Late Cretaceous; North America; Texas)." Weishampel, et al. (2004). Page 582.

References

Lehman, Thomas M.; Susan L. Tomlinson (2004). "Terlinguachelys fischbecki, a new genus and species of sea turtle (Chelonioidea: Protostegidae) from the Upper Cretaceous of Texas". Journal of Paleontology (The Paleontological Society) 78 (6): 1163–1178. doi:0022-3360/04/0078-1163$03.00. http://findarticles.com/p/articles/mi_qa3790/is_200411/ai_n9461510.
Longrich, N.R., Sankey, J., and Tanke, D. (2010) Texacephale langstoni, a new genus of pachycephalosaurid (Dinosauria: Ornithischia) from the upper Campanian Aguja Formation, southern Texas, USA. Cretaceous Research. doi: 10.1016/j.cretres.2009.12.002.
Sullivan, R.M., and Lucas, S.G. 2006. "The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.
Spencer G. Lucas, Robert M. Sullivan and Adrian P. Hunt: Re-evaluation of Pentaceratops and Chasmosaurus (Ornithischia: Ceratopsidae) in the Upper Cretaceous of the Western Interior. In: New Mexico Museum of Natural History and Science Bulletin 35 (2006), S. 367-370.PDF
Wagner, Jonathan R.; Lehman, Thomas M. (2009). "An Enigmatic New Lambeosaurine Hadrosaur (Reptilia: Dinosauria) from the Upper Shale Member of the Campanian Aguja Formation of Trans-Pecos Texas". Journal of Vertebrate Paleontology 29 (2): 605–611. doi:10.1671/039.029.0208. http://www.bioone.org/doi/abs/10.1671/039.029.0208.
Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.