Kopperl, Bosque Co. [Walnut Clay] (Cretaceous of the United States)

Also known as BEG Loc. 18-T-4

Where: Bosque County, Texas (32.1° N, 97.5° W: paleocoordinates 29.5° N, 57.5° W)

• coordinate based on nearby landmark

• outcrop-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

Collected by Dehlinger & Young in 1950

• COLLECTOR: M. E. Dehlinger & K. Young. REPOSITORY: Most University of Texas (UT), but also Bureau of Economic Geology, University of Texas (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 82876: 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.
Cephalopoda
 Ammonitida - Mojsisovicsiidae
"Manuaniceras carbonarium" = Oxytropidoceras (Manuaniceras) ammonite
Manuaniceras supani Lasswitz 1904 ammonite
"Venezoliceras texanum" = Oxytropidoceras (Venezoliceras) ammonite
Venezoliceras acutocarinatum Shumard 1853 ammonite