La Meseta Seymour Island, Unit III (Eocene of Antarctica)

Where: Antarctica (64.2° S, 56.6° W: paleocoordinates 64.3° S, 58.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Unit III Member (La Meseta Formation), Priabonian (38.0 - 33.9 Ma)

• La Meseta Unit III of Zinsmeister and Camacho (1982); Submeseta according to Reguero et al., 2013

•Strontium dating indicates Telm 7 to have been deposited between 39.1 and 34.0 Ma [148]. Samples from near the top of the formation fall closest to the presumed fossil horizon [145, 147], thus indicating an age of 34.2–34.0 Ma [148, 149]. (Marx & Fordyce, 2015)

• member-level stratigraphic resolution

Environment/lithology: lagoonal; fine-grained, medium sandstone

• shallow marine or strand line conditions, shallow, nearshore; estuary and delta, with tidal flats, channels, and inlets; tide-dominated
• homogeneous medium to fine-grained, moderately to well-sorted sand

Size class: macrofossils

Preservation: mold/impression, original phosphate

Reposited in the USNM

Collection methods: surface (float),

Primary reference: D. H. Elliot, C. Rinaldi, W. J. Zinsmeister, T. A. Trautman, W. A. Bryant and R. Valle. 1975. Geological investigations on Seymour Island, Antarctic Peninsula. Antarctic Journal 10(4):182-186 [M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45723: authorized by Mark Uhen, entered by Mark Uhen on 29.11.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Aves
 Carinatae -
Sphenisciformes indet.2 Sharpe 1891 penguin
Mammalia
 Cetacea -
Cetacea indet.4 Brisson 1762 whale
 Cetacea - Basilosauridae
Basilosauridae indet.1 Cope 1867 whale
Basilosauridae indet.3 Cope 1867 whale
It is not clear e
 Cetacea - Llanocetidae
Llanocetus denticrenatus n. gen. n. sp.2
Llanocetus denticrenatus n. gen. n. sp.2 Mitchell 1989 whale