Also known as M 576
Where: Leon County, Texas (31.2° N, 95.9° W: paleocoordinates 33.1° N, 84.8° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Wheelock Member (Crockett Formation), Lutetian (47.8 - 41.3 Ma)
• Upper Claiborne Group, Cook Mt. Fm. (now assigned to Crockett Formation), Wheelock Member, basal conglomerate. Calcareous nannoplankton indicates an age of biochronozone NP16 (Yancey and Davidoff, 1991, p. 80) and planktic foraminifers indicate deposition during the Morozovella lehneri (P12) or Orbulinoides beckmanni (P13) zones (Gaskell, 1989). A 25 cm thick volcanic ash bed present in overlying strata of the Crockett Formation, about 15 m above the Moseley bed (Kersey and Stanton, 1979), has an 40Ar/39Ar radiometric date of 41.841 ± 0.016 Ma (Heintz et al., 2015). The ash-bearing strata are further corroborated as upper part of biochronozone NP16 by Marie-Pierre Aubry (2002, unpublished report) and the upper part of biochronozone P12 (= E10–E11 biochronozones) by W. A. Berggren (2004, unpublished report), based on an overlap of Acarinina bullbrooki and Turborotalia pomeroli. Therefore, late Lutetian in age.
• group of beds-level stratigraphic resolution
Environment/lithology: transition zone or lower shoreface; lithified conglomerate
Size class: mesofossils
Primary reference: K. V. Palmer and D. C. Brann. 1965. Catalogue of the Paleocene and Eocene mollusca of the southern and eastern United States. Part 1. Pelecypoda, Amphineura, Peteropoda, Scaphopoda and Cephalopoda. Bulletins of American Paleontology 48:1-471 [M. Kosnik/M. Kosnik/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 98895: authorized by Jocelyn Sessa, entered by Ursula Smith on 22.10.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Eutrephoceras reesidei Stenzel 1940 |