TMM 43681, Dawson Creek (Cretaceous of the United States)

Also known as Big Bend

Where: Brewster County, Texas (29.3° N, 103.5° W: paleocoordinates 35.8° N, 77.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Aguja Formation, Middle Campanian (83.5 - 70.6 Ma)

• "upper shale member", just below contact with overlying Javelina Fm. Estimated as mid Campanian based on U-Pb dates from 3 km S at 76.0 ± 1.2 Ma

• bed-level stratigraphic resolution

Environment/lithology: delta plain; gray mudstone and fine-grained sandstone

• "These are part of a sequence of inclined, arrhythmic heterolithic strata (Wood et al., 1988) within an interval of relatively sandy coastal plain facies rock (Lehman, 1985)."
• "Site TMM 43681 lies within a dark grey mudstone just below a chaotically-bedded very fine sandstone with undulose contacts (Fig. 1)...This unit contains reworked ferruginous concretions, carbonaceous plant fragments, abraded fossil bone, and unionid bivalve fragments, and has been interpreted as a small tributary channel deposit (Wagner, 2001)."

Size classes: macrofossils, mesofossils

Reposited in the TMM

Primary reference: J. R. Wagner and T. M. Lehman. 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 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 90032: authorized by Matthew Carrano, entered by Matthew Carrano on 30.06.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Archosauria -
Archosauria indet.
Archosauria indet. Cope 1869 archosaur
ziphodont tooth
 Ornithischia -
Hadrosauria indet.
Hadrosauria indet. Horner 1990 ornithopod
 Ornithischia - Hadrosauridae
Angulomastacator daviesi n. gen. n. sp.
Angulomastacator daviesi n. gen. n. sp. Wagner and Lehman 2009 lambeosaurine
TMM 43681-1