El Mezquite (PASAC 1) (Cretaceous to of Mexico)

Also known as IGLUNAM, Sabinas

Where: Coahuila, Mexico (27.8° N, 101.2° W: paleocoordinates 34.0° N, 76.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Olmos Formation (Navarro Group), Late/Upper Campanian to Late/Upper Campanian (83.5 - 66.0 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
 Heterostropha - Physidae
Physidae indet.1 Fitzinger 1833 snail
 Heterostropha - Lymnaeidae
Lymnaeidae indet.1 Rafinesque 1815 snail
 Architaenioglossa - Viviparidae
Viviparidae indet.1 Gray 1847 snail
Reptilia
 Ornithischia - Hadrosauridae
Saurolophinae indet.2 Brown 1914 hadrosaurid
PASAC 1
 Theropoda - Tyrannosauridae
Tyrannosauridae indet.1 Osborn 1906 tyrannosaurid
IGM 6205, 6210–6212, teeth
 Loricata -
Crocodylia indet.1 crocodilian
teeth
Actinopteri
 Lepisosteiformes - Lepisosteidae
Lepisosteidae indet.1 Cuvier 1825 gar
"gar scales"
 Amiiformes - Amiidae
Melvius sp.1 Bryant 1987 bowfin
Chondrichthyes
 Rajiformes - Rhinobatidae
Myledaphus bipartitus1 Cope 1876 guitarfish
"Myledaphus bipartus"