M 331 (Eocene of the United States)

Where: Caldwell County, Louisiana (32.0° N, 92.0° W: paleocoordinates 33.0° N, 83.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Moodys Branch Formation (Jackson Group), Bartonian (41.3 - 38.0 Ma)

• member-level stratigraphic resolution

Environment/lithology: offshore; unlithified, argillaceous, calcareous siltstone

• Ennvironment from PBDB col# 1418
• Burrows unlithified argillaceous,calcareous siltstone. Lithology from PBDB col# 1418

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 92157: authorized by Jocelyn Sessa, entered by Laurie Eccles on 02.11.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Heterostropha - Architectonicidae
"Architectonica (Solariaxis) acuta" = Architectonica acuta Conrad 1854 sundial
 Sorbeoconcha - Capulidae
Capulus americanus Conrad 1854 snail
 Neogastropoda - Buccinidae
Pseudoliva vetusta Conrad 1833 true whelk
Pseudoliva vetusta perspectiva
 Neogastropoda - Fasciolariidae
Tritonatractus pearlensis Aldrich 1885 snail
[entered as Tritonoatractus pearlensis]
Dolicholatirus leaensis Harris 1897 snail
 Neogastropoda - Volutidae
Lapparia dumosa Conrad 1854 volute
Lapparia dumosa exiqua
Caricella howei Harris and Palmer 1947 volute
 Cerithioidea - Turritellidae
"Turritella alveata" = Kapalmerella alveata
"Turritella alveata" = Kapalmerella alveata Conrad 1854 turret shell
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium (Antalis) mississippiense Conrad 1848 tusk shell
Dentalium (Antalis) mississippiense jacksonense
Bivalvia
 Ostreida - Gryphaeidae
"Pycnodonta vicksburgensis" = Pycnodonte
"Pycnodonta vicksburgensis" = Pycnodonte oyster
Pycnodonta vicksburgensis var.
 Cardiida - Cardiidae
 Carditida - Carditidae