El Ocuca section [Cerro La Espina Mbr, Mural Fm] (Cretaceous of Mexico)

Where: Sonora, Mexico (30.6° N, 111.5° W: paleocoordinates 31.6° N, 65.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Cerro La Espina Member (Mural Formation), Aptian (125.0 - 113.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Cerro La Espina Mbr of the Mural Fm, which gradationally overlies the Cerro La Puerta Shale, and is overlain by the Mesa Quemada Mbr AGE: Aptian, on the basis of ammonite, bivalve, and foram biostratigraphy, and U/Pb zircon radiometric ages. STRATIGRAPHIC POSITION: List representative of entire member at this section.

• member-level stratigraphic resolution

Environment/lithology: offshore; lithified, intraclastic, shelly/skeletal wackestone and lithified, intraclastic, shelly/skeletal packstone

• ENVIRONMENT: Shallow marine siliciclastic, accumulated during maximum flooding phase.
• SPECIFIC LITHOLOGY: Various lithologies, including thick-bedded limestone, wackestone-packstone with bioclasts, intraclasts, pellets and micrite-rimmed grains of mollusca. LITHIFICATION: Lithified on the basis of figured specimens.

Size class: macrofossils

Preservation: replaced with calcite

Collection methods: COLLECTORS: Multiple collectors, principally, T. F. Lawton, and R. W. Scott. REPOSITORY: ERNO, Instituto de Geologia, Universidad Nacional Autónoma de México, Sonora, Mexico.

Primary reference: C. M. González-Léon, R. W. Scott, H. Löser, T. F. Lawton, E. Robert and V.A. Valencia. 2008. Upper Aptian-Lower Albian Mural Formation: stratigraphy, biostratigraphy and depositional cycles on the Sonoran shelf, northern Mexico. Cretaceous Research 29:249-266 [A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 82205: authorized by Austin Hendy, entered by Austin Hendy on 24.07.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to biostratigraphically or paleoecologically important taxa and those informally mentioned in text. NOMENCLATURE: Not an authoritative publication, but with fairly modern nomenclature, but unfortunately lacking some species-level identifications.
 Lituolacea - Nautiloculinidae
 Biokovinacea - Charentiidae
 Orbitolinacea - Orbitolinidae
 Textulariina - Cuneolinidae
 Hippuritida - Radiolitidae
Eoradiolites sp. Douvillé 1909 rudist
 Hippuritida - Monopleuridae
Petalodontia sp. Pocta 1889 rudist
Monopleura sp. Matheron 1842 rudist