Loc. 21, Arroyo Guayule [Aurora Limestone] (Cretaceous of Mexico)

Where: Coahuila de Zaragoza, Mexico (26.4° N, 103.3° W: paleocoordinates 25.3° N, 64.6° W)

• outcrop-level geographic resolution

When: Aurora Limestone Formation, Albian (113.0 - 100.5 Ma)

• STRATIGRAPHIC RELATIONS: From the Aurora Limestone, for which lithostratigraphic relationships are not discussed AGE: Albian, on the basis of biostratigraphic correlation to better dated Texan lithostratigraphic units. STRATIGRAPHIC POSITION: From Lima wacoensis quadrangularis zone; unknown position within the formation.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified limestone

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

Size class: macrofossils

Preservation: mold/impression

Collected by Kellum in 1953; reposited in the UMMP

Collection methods: surface (float), surface (in situ),

• COLLECTOR: Kellum, 1953. REPOSITORY: UMMP.

Primary reference: L. B. Kellum. 1956. Cretaceous invertebrates of the Aurora Limestone. Papers of the Michigan Academy of Science, Arts, and Letters 41:205-231 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88634: authorized by Austin Hendy, entered by Austin Hendy on 16.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for macrofossils. NOMENCLATURE: Authoritative publication, with antiquated nomenclature, but with species-resolution identifications.
Cephalopoda
 Ammonitida - Lyelliceratidae
"Budaiceras mexicanum" = Budaiceras hyatti
"Budaiceras mexicanum" = Budaiceras hyatti Shattuck 1903 ammonite
Gastropoda
 Trochoidea - Turbinidae
? Turbo sp. Linnaeus 1758 snail
 Pleurotomarioidea - Pleurotomariidae
"Pleurotomaria austinensis" = Pleurotomaria (Leptomaria) austinensis
"Pleurotomaria austinensis" = Pleurotomaria (Leptomaria) austinensis Shumard 1861 snail
 Cerithioidea - Turritellidae
Turritella sp. Lamarck 1799 turret shell
 Sorbeoconcha - Aporrhaidae
? Aporrhais sp. da Costa 1778 snail
Bivalvia
 Pectinida - Limidae
Lima wacoensis file clam
SUBSPECIES: Lima wacoensis quadrangularis
 Pectinida - Pectinoidae
Pecten sp., "Pecten texanus" = Camptonectes virgatus
Pecten sp. Müller 1776 scallop
"Pecten texanus" = Camptonectes virgatus Nilsson 1827 scallop
 Pholadomyida - Pholadomyidae
Pholadomya sp. Sowerby 1823 clam
Homomya sp. Agassiz 1843 clam
 Hippuritida - Radiolitidae
 Cardiida - Trapezidae
Echinoidea
 Spatangoida - Toxasteridae
Enallaster texanus Roemer 1849 heart urchin
 Spatangoida - Hemiasteridae
? Hemiaster calvani heart urchin