R55. Cerro Rajón (Cambrian of Mexico)

Where: Mexico (30.4° N, 111.9° W: paleocoordinates 6.1° S, 105.0° W)

When: Unit 2 Member (Puerto Blanco Formation), Montezuman (520.0 - 515.3 Ma)

• bed-level stratigraphic resolution

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

• Represents a southern extension of the Cordilleran miogeocline, rocks may be offset 700 to 800km along a left- lateral fault.
• Siltstone, yellow gray, dusty yellowm and grayish red, micaceous, abundant borrows, tracks, and traits. Quartzite, very fine grained, evenly laminated. Sparse limy siltstone to silty limestone beds.

Size classes: macrofossils, mesofossils

Collection methods: bulk,

Primary reference: L. Devaere, S. Clausen, J. P. Sosa-Leon, J. J. Palafox-Reyes, B. E. Buitrón-Sánchez and D. Vachard. 2019. Early Cambrian Small Shelly Fossils from northwest Mexico: Biostratigraphic implications for Laurentia. Palaeontologia Electronica 22(2):1-58 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 203104: authorized by Pete Wagner, entered by Pete Wagner on 26.07.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
 Hyolithelminthida - Hyolithellidae
Hyolithellus spp.
Hyolithellus spp. Billings 1872
Helcionelloida
 Helcionellida - Trenellidae
Mackinnonia corrugata
Mackinnonia corrugata Bengtson et al. 1990
Coeloscleritophora
 Chancelloriida - Chancelloriidae
Archiasterella charma, Archiasterella cf. pentactina