Tornillo Flats, Big Bend NP (UT-Dallas) (Cretaceous of the United States)

Where: Texas (29.5° N, 103.1° W: paleocoordinates 36.0° N, 82.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Javelina Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: "floodplain"; concretionary, intraclastic, green, carbonaceous siltstone

• "The quarry is composed of two basic lithologies. The lower unit is a light to medium gray to greenish-gray siltstone, generally massive in appearance. Brownish-gray clay clasts, up to 1 cm in diameter (though most are only 1-2 mm in diameter), are locally abundant. Clay slickensides are common. Carbonate nodules are present throughout and many contain bone. This unit is at least 2 m thick with bones occurring through the approximately upper 1.5 m. The greenish siltstone has weak, "swirled" bedding occurring irregularly through the unit. The upper contact is sharp and irregular."

Size class: macrofossils

Preservation: concretion

Collected by A. Fiorillo in 1995

Collection methods: quarrying, mechanical,

Primary reference: A. R. Fiorillo. 1998. Preliminary report on a new sauropod locality in the Javelina Formation (Late Cretaceous), Big Bend National Park, Texas. In V. L. Santucci & L. McClelland (eds.), National Park Service Geologic Resources Division Technical Report NPS/NRGRD/GRDTR-98/01. National Park Service Paleontological Research Volume 3:29-31 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 61847: authorized by Matthew Carrano, entered by Matthew Carrano on 05.07.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Saurischia - Saltasauridae
Alamosaurus sanjuanensis
Alamosaurus sanjuanensis Gilmore 1922 saltasaurine
3 juveniles