North of Sabinal, Uvalde Co. [Austin Chalk] (Cretaceous of the United States)

Where: Medina County, Texas (29.3° N, 99.5° W: paleocoordinates 31.5° N, 68.6° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Austin Chalk Formation, Coniacian (89.8 - 86.3 Ma)

• STRATIGRAPHIC RELATIONS: From the Austin Chalk, for which lithostratigraphic relationships are not disucssed. AGE: Coniacian, on the basis of antiquated ammonite biostratigraphy. STRATIGRAPHIC POSITION: Checklist representative of entire formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified marl

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

Size class: macrofossils

Collection methods: surface (in situ),

• COLLECTORS: Unknown. REPOSITORY: USNM.

Primary reference: J. B. Reeside. 1932. The Upper Cretaceous ammonite genus Barroisiceras in the United States. United States Geological Survey Professional Paper 170(B):9-21 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88538: authorized by Austin Hendy, entered by Austin Hendy on 14.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to Barroisiceras described in publication. NOMENCLATURE: Authoritative publication, with somewhat antiquated nomenclature, but with species-resolution identifications.
Show authors, comments, and common names
Bivalvia
 Ostreida - Gryphaeidae
Gryphaea aff. aucella
 Myalinida - Inoceramidae
"Inoceramus aff. deformis" = Cremnoceramus deformis
"Inoceramus aff. deformis" = Cremnoceramus deformis Meek 1871 clam
Cephalopoda
 Ammonitida - Muniericeratidae
Barroisiceras (Texasia) dartoni
Barroisiceras (Texasia) dartoni Reeside 1932 ammonite