Sierra Hermosa de Santa Rosa [La Péna Fm] (Cretaceous of Mexico)

Where: Coahuila de Zaragoza, Mexico (27.8° N, 101.9° W: paleocoordinates 26.8° N, 57.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: La Péna Formation, Late/Upper Aptian (122.5 - 112.0 Ma)

• STRATIGRAPHIC RELATIONS: From the La Péna Fm, which overlies the Cupido Fm. AGE: Late Aptian, on the basis of ammonoid biostratigraphy. STRATIGRAPHIC POSITION: From unknown part of the formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified limestone and lithified, calcareous marl

• SPECIFIC LITHOLOGY: Limestone and calcareous marl. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: mold/impression

Collection methods: surface (in situ),

• COLLECTOR: Unknown. REPOSITORY: Unknown.

Primary reference: A. Cantu-Chapa. 1962. Étude biostratigraphique des Ammonites (Jurassique supérieur et Crétacé) du Mexique (Centre et Nord). Unpublished PhD thesis, A la Faculté des Sciences de L'Université de Paris 1-103 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89547: authorized by Austin Hendy, entered by Austin Hendy on 01.06.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for ammonites. NOMENCLATURE: Authoritative publication, with somewhat antiquated nomenclature, and species-resolution identifications.
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Cephalopoda
 Ammonitida - Desmoceratidae
Burckhardtites sp.
Burckhardtites sp. Humphrey 1949 ammonite
 Ammonitida - Prolyelliceratidae
Prolyelliceras aff. prorsocurvatum
Prolyelliceras aff. prorsocurvatum Gerhardt 1897 ammonite
 Ammonitida - Parahoplitidae
Hypacanthoplites aff. clavatus, Hypacanthoplites burckhardti, Hypacanthoplites aff. sarasini, Hypacanthoplites aff. rugosus, Hypacanthoplites plesiotypicus, Paracanthoplites sp., "Acanthohoplites aff. abichi" = Protacanthoplites abichi, Immunitoceras pruvosti n. sp., "Acanthohoplites aff. ashiltaensis" = Acanthohoplites, "Acanthoplites sp." = Acanthohoplites, Colombiceras sp.
Hypacanthoplites plesiotypicus Fritel 1906 ammonite
Paracanthoplites sp. Stoyanow 1949 ammonite
"Acanthohoplites aff. abichi" = Protacanthoplites abichi Anthula 1900 ammonite
Immunitoceras pruvosti n. sp. ammonite
"Acanthohoplites aff. ashiltaensis" = Acanthohoplites ammonite
"Acanthoplites sp." = Acanthohoplites Sinzow 1908 ammonite
Colombiceras sp. Spath 1923 ammonite
 Ammonitida - Douvilleiceratidae
Cheloniceras aff. subnodocostatum, Megatyloceras sp.
 Ammonitida - Ancyloceratidae
Pedioceras sp.
Pedioceras sp. Gerhardt 1897 ammonite