Rancho Bufalo section [Fronteros Mbr, Mural Fm] (Cretaceous of Mexico)

Where: Sonora, Mexico (31.1° N, 109.6° W: paleocoordinates 31.2° N, 69.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Fronteros Member (Mural Formation), Albian (113.0 - 100.5 Ma)

• STRATIGRAPHIC RELATIONS: From the Fronteros Mbr of the Mural Fm, which sharply overlies the fluvial Morita Fm, and is overlain by the Rancho Bufalo 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: shallow subtidal; lithified, ooidal grainstone and lithified, ooidal, shelly/skeletal packstone

• ENVIRONMENT: High energy very shallow to marginal-marine carbonate setting, accumulated in early transgression.
• SPECIFIC LITHOLOGY: Various lithologies, including medium-bedded, oolitic grainstone with planar cross-stratification and thick to medium beds of bioclastic and oolitic packstone, shaly bioclastic wackestone with oysters, sandy bioturbated wackestone and calcareous shale. 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 82212: 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
Ulvophyceae
 Bryopsidales - Codiaceae
Arabicodium texana
Bivalvia
 Trigoniida - Megatrigonioidae
"Pisotrigonia sp." = Pterotrigonia
"Pisotrigonia sp." = Pterotrigonia van Hoepen 1929 clam