Xochixtlapilco tracksite (Jurassic to of Mexico)

Where: Oaxaca, Mexico (17.8° N, 97.8° W: paleocoordinates 9.4° N, 47.8° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Tecocoyunca Group, Early/Lower Bajocian to Early/Lower Bajocian (171.6 - 164.7 Ma)

• age based on more southerly exposures of the unit, which contain ammonites and other invertebrates.

• bed-level stratigraphic resolution

Environment/lithology: delta plain; red siltstone

• "shore of a coastal lagoon"; "a huge delta complex"
• "red, shaley, laminar to very thinly bedded phyllarenitic siltstone"; "red, thin to medium bedded phyllarenitic siltstone, sandstone, and conglomerate."

Size class: macrofossils

Preservation: cast, mold/impression, trace

Collected by O. Comas in 1981

Collection methods: surface (in situ), peel or thin section,

Primary reference: I. Ferrusquia-Villafranca, E. Jimenes-Hidalgo, and V. M. Bravo-Cuevas. 1995. Jurassic and Cretaceous dinosaur footprints from Mexico: additions and revisions. Journal of Vertebrate Paleontology 15(3, suppl.):28A [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 36267: authorized by Matthew Carrano, entered by Matthew Carrano on 22.01.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Saurischia -
Sauropoda indet. sauropod
morphotype C, morphic types Cl-Co; IGM-7958
 Avetheropoda - Allosauridae
? Allosauridae indet.1 Marsh 1878 allosaurid
IGM-7959, 3006
 Avetheropoda -
Coelurosauria indet.2 Huene 1914 coelurosaur
incl. 3 trackways, morphotype A, morphic varieties Aa-Ak; IGM-9303-9315, 7425, 7428, 7430, 7458
 Neornithischia -
? Ankylopollexia indet.1 Sereno 1986 bird foot dinosaur
morphotype D, morphic types Dp-Dq; IGM-7960