Keys Valley School, Bell Co. [Walnut Clay] (Cretaceous of the United States)

Where: Bell County, Texas (31.1° N, 97.5° W: paleocoordinates 28.6° N, 57.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Walnut Clay Formation, Middle Albian (109.0 - 105.3 Ma)

• STRATIGRAPHIC RELATIONS: From the Walnut Clay, which overlies the Paluxy Sandstone and is overlain by the Comanche Peak Limestone or Goodland Limestone. It is a lateral correlative of the Keys Valley Marl. AGE: Middle Albian; Oxytropidoceras salasi zone. STRATIGRAPHIC POSITION: From unknown position within formation.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified claystone

• ENVIRONMENT: Offshore siliciclastic marine setting.
• SPECIFIC LITHOLOGY: Not specifically stated in text, but probably claystone. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: COLLECTOR: Unknown, but may include K. Young, 1966. REPOSITORY: Most University of Texas (UT), but also BEG.

Primary reference: K. Young. 1966. Texas Mojsisoviciziinae (Ammonoidea) and the zonation of the Fredricksburg. Geological Society of America Memoir 100:1-225 [A. Hendy/A. Hendy/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 82860: authorized by Austin Hendy, entered by Austin Hendy on 03.08.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to taxonomic group described by systematic publication (Mojsisoviciinae; Ammonoidea). NOMENCLATURE: Authoritative publication, with relatively modern nomenclature and species resolution identifications.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Mojsisovicsiidae
"Venezoliceras texanum" = Oxytropidoceras (Venezoliceras), "Venezoliceras sp." = Oxytropidoceras (Venezoliceras), Venezoliceras acutocarinatum
"Venezoliceras texanum" = Oxytropidoceras (Venezoliceras) ammonite
"Venezoliceras sp." = Oxytropidoceras (Venezoliceras) Spath 1925 ammonite
Venezoliceras acutocarinatum Shumard 1853 ammonite