Mountain Pass tracksite, Mescal Range (SBCM) (Jurassic of the United States)

Where: San Bernardino County, California (35.4° N, 115.5° W: paleocoordinates 20.8° N, 53.4° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Aztec Sandstone Formation, Early/Lower Jurassic (201.4 - 174.7 Ma)

• bed-level stratigraphic resolution

Environment/lithology: dune; lithified, yellow, cherty/siliceous sandstone and coarse-grained, white, silty sandstone

• Aztec Sandstone is made up of two units. The lower resistant sandstone unit (100m thick) is tan to off-white in outcrops but pinkish in fresh exposures. Crosbedded lenses can easily be observed. Frosted and pitted quartz grains well-cemented by silica are described by Evans (1958,1971). The upper and less resistant unit (200m thick) consists of alternating white quartz arenites and red to brown silty sands.

Size class: macrofossils

Preservation: trace

Collected by J. R. Evans in 1958

Collection methods: peel or thin section,

Primary reference: R. E. Reynolds. 1986. California trackways from the Lower Jurassic Aztec Sandstone. In D. D. Gillette (ed.), First International Symposium on Dinosaur Tracks and Traces. Abstracts with Program 24 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 52175: authorized by Matthew Carrano, entered by Kaitlin Maguire on 28.07.2005, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

• Many unnamed and unclassified tracks are listed and partially described but not classified formally.
Show authors, comments, and common names
Osteichthyes
 Synapsida - Chelichnopodidae
Brasilichnium sp.2
Brasilichnium sp.2 Leonardi 1981 synapsid
Reptilia
 Pterosauria - Pteraichnidae
Pteraichnus sp.2
Pteraichnus sp.2 Stokes 1957 pterosaur
 Dinosauria -
Dinosauria indet.1
Dinosauria indet.1 dinosaur
"unnamed broad form", bipedal; abundant
 Saurischia -
Navahopus sp.2
Navahopus sp.2 Baird 1980 sauropodomorph
 Theropoda - Grallatoridae
Grallator sp., Anchisauripus sp.
Grallator sp. Hitchcock 1858 theropod
Anchisauripus sp. Lull 1904 theropod
 Ichnofossils -
Skolithos sp.2, Octopodichnus sp.2
Skolithos sp.2 Haldemann 1840
Octopodichnus sp.2 Gilmore 1927
1Reynolds 1989; 2Reynolds 2006