M 36 (Eocene of the United States)

Where: St. Francis County, Arkansas (35.0° N, 90.8° W: paleocoordinates 35.9° N, 81.6° 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: marine; lithology not reported

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 99180: authorized by Jocelyn Sessa, entered by Laurie Eccles on 01.11.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Pectinoidae
 Ostreida - Ostreidae
Crassostrea "sp. A" Sacco 1897 oyster
 Arcida - Arcidae
 Carditida - Carditidae
 Pholadida - Corbulidae
Caryocorbula willistoni Meyer 1885 clam
Including Caryocorbula willistoni arkansia and Corbula (Caryocorbula) willistoni arkansia
 Cardiida - Mactridae
cf. Spisula sp. Gray 1837 clam
Spisula cf. praetenuis
 Cardiida - Veneridae
 Thraciida - Periplomatidae
Periploma collardi Harris 1895 clam
Periploma collardi turgidum
Gastropoda
 Cerithioidea - Turritellidae
"Turritella arenicola" = Kapalmerella arenicola Conrad 1865 turret shell
Turritella clevelandia Harris 1894 turret shell
 Neogastropoda - Fasciolariidae
"Cornulina dalli" = Mazzalina dalli, Mazzalina inaurata
"Cornulina dalli" = Mazzalina dalli Harris 1894 snail
Mazzalina inaurata Conrad 1833 snail
Including Mazzalina inaurata humerosa, Mazzalina inaurata oweni and Mazzalina inaurata pyrula
 Neogastropoda - Turridae
Coronia childreni Lea 1833 turrid
Coronia childreni
 Neogastropoda - Volutidae
Caricella subangulata Conrad 1854 volute