Rancho Bufalo section [Cerro La Puerta Shale Mbr, Mural Fm] (Cretaceous of Mexico)

Where: Sonora, Mexico (31.1° N, 109.6° W: paleocoordinates 31.7° N, 63.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• STRATIGRAPHIC RELATIONS: From the Cerro La Puerta Shale Mbr of the Mural Fm, which gradationally overlies the Los Coyotes, and is overlain by the Cerro La Espina 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, brown, gray, yellow shale and lithified wackestone

• ENVIRONMENT: Shallow marine siliciclastic, accumulated during maximum flooding phase.
• SPECIFIC LITHOLOGY: Various lithologies, including light-gray shale that weathers dark to yellowish brown with subordinate thin to medium beds of wackestone. LITHIFICATION: Lithified on the basis of figured specimens.

Size class: macrofossils

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 82201: 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.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Douvilleiceratidae
Douvilleiceras sp.
Douvilleiceras sp. Grossouvre 1894 ammonite