Tren Fm., Cerro Rajon, Caborca Region, Mexico - Stewart et. al 1984 (Cambrian of Mexico)

Where: Mexico (30.4° N, 111.9° W: paleocoordinates 4.6° S, 101.3° W)

When: Glossopleura zone, Tren Formation (Albertella-Glossopleura (lower) Group), Delamaran (511.2 - 506.5 Ma)

• All lithology/stratigraphic details are based primarily on exposures of rocks in the Cerro Rajon area. A complete section of this formation is not known in the Caborca Region

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified limestone

• Represents a southern extension of the Cordilleran miogeocline, rocks may be offset 700 to 800km along a left- lateral fault.

Size classes: macrofossils, mesofossils

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 10688: 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 - Acrothelidae
Acrothele sp.
Acrothele sp. Linnarsson 1876
 Acrotretida - Acrotretidae
Linnarssonia arellanoi
Paterinata
 Paterinida - Paterinidae
Dictyonina sp.
Dictyonina sp. Cooper 1942
Trilobita
 Corynexochida - Dolichometopidae
Athabaskia minor
Athabaskia minor Resser 1938 trilobite
 Ptychopariida - Alokistocaridae
Inglefieldia imperfecta, Parehmania sp.
Inglefieldia imperfecta Lochman 1952 trilobite
Parehmania sp. Deiss 1939 trilobite