Ojo de Agua, 1.25 mi. NE of [Indidura Fm] (Cretaceous of Mexico)

Where: Coahuila de Zaragoza, Mexico (29.3° N, 101.1° W: paleocoordinates 27.7° N, 61.6° W)

• outcrop-level geographic resolution

When: Indidura Formation, Albian (113.0 - 100.5 Ma)

• STRATIGRAPHIC RELATIONS: From the Indidura Fm, which overlies the Aurora Limestone. AGE: Cenomanian, on the basis of biostratigraphic correlation to better dated Texan lithostratigraphic units, and ammonite biostratigraphy. STRATIGRAPHIC POSITION: From float at the the top of a bluff where limestone is in thin platy layers that form a more continuous outcrop than the underlying strata.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, gray limestone

• SPECIFIC LITHOLOGY: Thin-bedded, platy, rubbly, and marly gray limestone, weathered buff color. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: mold/impression

Collected by Kellum in 1941; reposited in the UMMP

Collection methods: surface (float),

• COLLECTOR: L. B. Kellum, 1935. REPOSITORY: UMMP.

Primary reference: L. B. Kellum and W. I. Robinson. 1963. Geology of the west-central part of the Sierra de Tlahualilo, Coahuila, Mexico. Papers of the Michigan Academy of Science, Art, and Letters 48:223-261 [A. Hendy/A. Hendy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 88677: authorized by Austin Hendy, entered by Austin Hendy on 17.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for a range of macroinvertebrates. NOMENCLATURE: Not an authoritative publication, with somewhat antiquated nomenclature, but with species-resolution identifications.
Cephalopoda
 Ammonitida - Acanthoceratidae
? Watinoceras sp. Warren 1930 ammonite
Bivalvia
 Ostreida - Gryphaeidae
Exogyra "sp. B" Say 1820 oyster
Exogyra "sp. C" Say 1820 oyster
Gryphaea sp. Lamarck 1801 oyster
 Myalinida - Inoceramidae
Inoceramus sp. Sowerby 1814 clam
 Pholadomyida - Pholadomyidae
 Cardiida - Arcticidae
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
Echinoidea
 Spatangoida - Hemiasteridae
Hemiaster calvani, "Hemiaster bexari" = Hemiaster wetherbyi
Hemiaster calvani heart urchin
"Hemiaster bexari" = Hemiaster wetherbyi de Loriol 1887 heart urchin
 Holasteroida - Holasteridae
Holaster nanus sea urchin