El Mezquite, Sabinas (PASAC/IGLUNAM) (Cretaceous of Mexico)

Where: Coahuila, Mexico (27.8° N, 101.2° W: paleocoordinates 33.8° N, 75.0° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Olmos Formation (Difunta Group), Late/Upper Campanian (83.5 - 70.6 Ma)

• originally assigned to the San Miguel Fm., now low in Olmos Fm. "in zone 1 above coal-bearing layers"

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; pebbly, intraclastic mudstone and concretionary, gray, green, silty, calcareous claystone

• "...may represent crevasse splays, although a source channel was not recognized."
• "an interval of gravelly mudstone with laterally extensive carbonate nodule beds 10-30 cm thick. Clasts in this bed include carbonate and phosphate pebbles, molds of freshwater snails, and abundant plant fragments. These beds are very poorly sorted...The bones are preserved at the base of a 2-3 m thick interval of olive-gray silty claystone containing scattered centimeter-scale carbonate nodules"

Size classes: macrofossils, mesofossils

Collected by P. Garcia-de la Garza in 2001

Primary reference: R. Hernandez, J. I. Kirkland, G. S. Paul, C. B. Serrano, and J. P. Garcia. 2003. A large hadrosaurine from the Sabinas Basin, Coahuila Mexico. Journal of Vertebrate Paleontology 23(3, suppl.):61A [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 69800: authorized by Matthew Carrano, entered by Matthew Carrano on 07.03.2007, edited by Jonathan Tennant

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Neretidae indet.1
"ornate"
Gastropoda
 Architaenioglossa - Viviparidae
Viviparidae indet.1 Gray 1847 snail
 Basommatophora - Physidae
Physidae indet.1 Fitzinger 1833 pulmonate
 Basommatophora - Lymnaeidae
Lymnaeidae indet.1 Rafinesque 1815 pulmonate
Chondrichthyes
 Myliobatiformes - Dasyatidae
Myledaphus bipartitus1 Cope 1876 whiptail stingray
"Myledaphus bipartus"
Actinopteri
 Amiiformes - Amiidae
Melvius sp.1 Bryant 1987 bowfin
 Lepisosteiformes - Lepisosteidae
Lepisosteidae indet.1 Cuvier 1825 gar
"gar scales"
Reptilia
 Avetheropoda - Tyrannosauridae
Tyrannosauridae indet.1 Osborn 1906 tyrannosaurid
teeth
 Neornithischia - Hadrosauridae
Saurolophinae indet.2 Brown 1914 hadrosaurid
PASAC 1
 Loricata -
Crocodylia indet.1 crocodilian
teeth