Cerro Rajon, 3 (Cambrian to of Mexico)

Also known as Locality 1

Where: Sonora, Mexico (30.4° N, 112.0° W: paleocoordinates 10.1° S, 106.7° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Nevadella trilobite zone, Unit 3 Member (Puerto Blanco Formation), Meishucunian to Meishucunian (541.0 - 520.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; limestone and silty shale

• a shallow marine carbonate and fine clastic unit with volcanoclastics near its base

Size class: macrofossils

Preservation: mold/impression

Collection methods: surface (float), acetic,

• Specimens assigned IGM numbers are deposited at the Instituto de Geologia, Cuidad Universitaria, DelegaciĆ³n de Coyoacan

Primary reference: M. A. S. McMenamin. 1987. Lower Cambrian trilobites, donation, and correlation of the Puerto Blanco formation, Sonora Mexico. Journal of Paleontology 61(4):738-749 [N. Heim/C. Lombardi]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 210979: authorized by Noel Heim, entered by Cole Lombardi on 22.06.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Redlichiida -
Judomia sp. Lermontova 1943 trilobite
Judomia orbis n. sp. McMenamin 1987 trilobite
IGM 3649
Nevadia ovalis n. sp. McMenamin 1987 trilobite
IGM 3655
 Redlichiida - Olenellidae
Olenellidae indet. Walcott 1890 trilobite
1 specimen