Santa Ana section [Cerro La Ceja Mbr, Mural Fm] (Cretaceous of Mexico)

Where: Sonora, Mexico (29.0° N, 111.6° W: paleocoordinates 30.1° N, 65.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• STRATIGRAPHIC RELATIONS: From the Cerro La Ceja Member of the Mural Fm, which overlies unconformably the Rancho Buffalo Mbr and the Morita Fm, and is overlain by the Tuape Shale. 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: coastal; lithified sandstone and lithified, shelly/skeletal, green, argillaceous, silty, calcareous wackestone

• ENVIRONMENT: Shallow marine siliciclastic, accumulated during transgressive phase.
• SPECIFIC LITHOLOGY: Various lithologies, including quartz-rich sandstone with large-scale, planar- and trough-cross stratification, thin- to medium-bedded bicolastic wackestone and grainstone (calcarenite to calcirudite) and interbedded liht gray to green shale and siltstone. LITHIFICATION:

Size class: macrofossils

Collection methods: COLLECTORS: Multiple collectors, principally, T. F. Lawton. 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 82136: authorized by Austin Hendy, entered by Austin Hendy on 23.07.2008

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.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Acanthohoplitidae
Immunitoceras immunitum
Immunitoceras immunitum Stoyanow 1949 ammonite
 Ammonitida - Douvilleiceratidae
Eodouvilleiceras adkinsi
Eodouvilleiceras adkinsi Scott 1940 ammonite
 Ammonitida - Desmoceratidae
"Burckhardites sp." = Burckhardtites
"Burckhardites sp." = Burckhardtites Humphrey 1949 ammonite