Cerro Rajon (Cambrian of Mexico)

Also known as Proveedora Fm., Cerro Rajon, Caborca Region, Mexico - Stewart et. al 1984

Where: Mexico (30.4° N, 111.9° W: paleocoordinates 4.5° S, 102.4° W)

When: Proveedora Quartzite Formation (Bonnia-Olenellus Group), Dyeran (515.3 - 511.2 Ma)

• All lithology/stratigraphic details are based primarily on exposures of rocks in the Cerro Rajon area. Unit is 201m thick. Formation creates a conspicuous ridge or ledge in most areas.

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, gray sandstone and lithified siltstone

• Represents a southern extension of the Cordilleran miogeocline, rocks may be offset 700 to 800km along a left- lateral fault.
• Quartzite, pinkish gray, fine to medium grained, scattered coarse grains, laminated to very thin bedded; common very thin tabular planar sets of low angle cross strata. Abundant Skolithos in lower 90m. Sparse micaceous siltstone layers in lower 83m.

Size classes: macrofossils, mesofossils

Preservation: trace

Collection methods: bulk,

Primary reference: J. Stewart, M. A. S. McMenamin, and J. M. Morales-Ramirez. 1984. Upper Proterozoic and Cambrian rocks in the Caborca Region, Sonora, Mexico - physical stratigraphy, biostratigraphy, paleocurrent studies, and regional relations. U. S. Geological Survey Professional Papers (1309)1-33 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10683: authorized by Mark Patzkowsky, entered by Phil Borkow on 11.06.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Lingulata
 Lingulida - Obolidae
Lingulella sp.
Lingulella sp. Salter 1866
Trilobita
 Redlichiida - Wanneriidae
? Wanneria sp.
? Wanneria sp. Walcott 1910 trilobite
*
 Ichnofossils -
Skolithos sp.
Skolithos sp. Haldemann 1840