Locality 1538 - Sobral Fm, Seymour Island (Paleocene of Antarctica)

Where: Antarctica (64.3° S, 56.8° W: paleocoordinates 63.1° S, 66.7° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Sobral Formation, Danian (66.0 - 61.6 Ma)

• STRATIGRAPHIC RELATIONS: From Sobral Formation, which unconformably overlues the Lopez de Bertodana Fm (Late Maastrichtian-Danian) and is overlain by the La Meseta Fm. THICKNESS: Section reachs 1600 m in thickness, presumably collection is from a horizon of bed-scale thickness. AGE: Early Danian. STRATIGRAPHIC POSITION: 1103.80 m

• bed-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, gray, silty sandstone

• ENVIRONMENT: Sandy, shallow-middle shelf, temperate coastal waters, normal salinity.
• SPECIFIC LITHOLOGY: Gray-tan, fine-grained, silty sandstone. LITHIFICATION: Poorly-lithified, on the basis of figured specimens.

Size class: macrofossils

Reposited in the USNM

Collection methods: bulk,

• COLLECTORS: Stilwell and Zinsmeister. REPOSITORY: Most all material is reposited in USNM collections.

Primary reference: J. D. Stilwell, W. J. Zinsmeister, and A. E. Oleinik. 2004. Early Paleocene Mollusks of Antarctica: Systematics, Paleoecology and Paleobiogeographic Significance. Bulletins of American Paleontology 367 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 67061: authorized by Austin Hendy, entered by Austin Hendy on 05.11.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Authoritative publication with consistent use of species and subgenus designations, and with biogeographic consideration.
 Cardiida - Veneridae
Marwickia woodburnei Zinsmeister and Macellari 1988 venus clam
 Cardiida - Lahillidae
Lahillia larseni Sharman and Newton 1897 clam
 Thraciida - Periplomatidae
Periploma "n. sp." Schumacher 1816 clam
 Protobranchia - Nuculanidae
Jupiteria sp. Bellardi 1875 pointed nut clam
 Opisthobranchia - Cylichnidae
Cylichnania cf. impar Finlay and Marwick 1937 snail
 Neogastropoda - Buccinidae
Seymourosphaera bulloides Oleinik and Zinsmeister 1996 true whelk
 Neogastropoda - Melongenidae
Levifusus woolfei n. sp. Stilwell et al. 2004 snail
 Stromboidea - Aporrhaidae
Struthiochenopus hurleyi n. sp. Stilwell et al. 2004 snail
 Naticoidea - Naticidae
Euspira antarctidia n. sp. Stilwell et al. 2004 moon snail