Arroyo Caballeo [Escondido beds] (Cretaceous of Mexico)

Where: Coahuila de Zaragoza, Mexico (28.2° N, 100.2° W: paleocoordinates 34.3° N, 79.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Escondido Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Escondido beds, for which lithostratigraphic relationships are not discused. AGE: Late Maastrichtian; on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From upper Escondido beds.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified sandstone and lithified, sandy shale

• SPECIFIC LITHOLOGY: Sandstone or sandy shale. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: mold/impression

Collected by Bose; reposited in the UCMP

Collection methods: surface (in situ),

• COLLECTOR: Not stated, but presumably E. Böse. REPOSITORY: University of California, Berkeley.

Primary reference: E. Böse. 1928. Cretaceous ammonites from Texas and northern Mexico. University of Texas Bulletin 2748:143-357 [A. Hendy/A. Hendy/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88246: authorized by Austin Hendy, entered by Austin Hendy on 04.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Probably not exhaustive, but comprehensive for ammonoids. NOMENCLATURE: Authoritative publication with somewhat antiquated nomenclature, but with species-resolution identifications.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Sphenodiscidae
Sphenodiscus pleurisepta, Sphenodiscus aberrans n. sp.
Sphenodiscus pleurisepta Conrad 1857 ammonite
Sphenodiscus aberrans n. sp. Böse 1928 ammonite