Also known as Big Bend N.P.
Where: Brewster County, Texas (29.4° N, 103.2° W: paleocoordinates 36.0° N, 82.5° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Black Peaks Formation (Tornillo Group), Late/Upper Maastrichtian (70.6 - 66.0 Ma)
• Just below the Cretaceous/Tertiary boundary and approx. 50 m above the Javelina Formation; located about 90 meters above a tuff dated as 69.0 ± 0.9 Ma (U-Pb) (late Edmontonian to Lancian NALMA)
• bed-level stratigraphic resolution
Environment/lithology: lacustrine - small; burrowed, gray, calcareous mudstone and limestone
Size class: macrofossils
Preservation: replaced with calcite
Collected by T. Lehman in 1995; reposited in the TMM
Collection methods: quarrying, surface (float), surface (in situ), mechanical,
Primary reference: T. M. Lehman and A. B. Coulson. 2002. A juvenile specimen of the sauropod dinosaur Alamosaurus sanjuanensis from the Upper Cretaceous of Big Bend National Park, Texas. Journal of Paleontology 76(1):156-172 [M. Carrano/K. Maguire/M. Carrano]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 52087: authorized by Matthew Carrano, entered by Kaitlin Maguire on 20.07.2005, edited by Matthew Carrano
Creative Commons license: CC BY (attribution)
Taxonomic list
Reptilia | |
| |
unclassified | |
Charophyta indet. Migula 1890 |