Gamuza Fm, Upper unit, Cerro Rajon, Caborca Region, Mexico - Stewart et. al 1984 (Ediacaran of Mexico)

Where: Mexico (30.4° N, 111.9° W: paleocoordinates 40.8° S, 133.9° W)

• local area-level geographic resolution

When: Upper unit Member (Gamuza Formation), Ediacaran (635.0 - 541.0 Ma)

• All lithology/stratigraphic details are based primarily on exposures of rocks in the Cerro Rajon area. Unit is 60 meters thick.

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, gray dolomite

• Represents a southern extension of the Cordilleran miogeocline, rocks may be offset 700 to 800km along a left-lateral fault.
• Stromatolitic dolomite, medium gray, weathers medium gray with irregular grayish orange mottling, composed of cnical stromatolites mostly 5-20 cm in diameter.

Size class: macrofossils

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 10662: authorized by Mark Patzkowsky, entered by Phil Borkow on 08.06.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• Distribution of fauna and flora in upper Proterozoic and Cambrian strata of the Caborca region, Mexico. Based in part on Cooper and others (1952), Lochman (1953), Rowell (1962), Fritz (1975), Weber and others (1979), Yochelson (1981), A. R. Palmer (written communs., 1981-82), S. M. Awramik (oral commun., 1982), and McMenamin and others (1983).
Show authors, comments, and common names
unclassified
  -
Jacutophyton sp.
Ostracoda
 Platycopida - Cytherellidae
Platella sp.
Platella sp. Coryell and Fields 1937 ostracod
*
Algae
  -
Conophyton sp.
Conophyton sp. Maslov 1937
*