Seymour Island (Klb9) (Cretaceous of Antarctica)

Also known as Plesiosaur locality; Isla Marambio

Where: Antarctica (64.3° S, 56.7° W: paleocoordinates 62.6° S, 67.3° W)

• coordinate stated in text

• small collection-level geographic resolution

When: López de Bertodano Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Central part of Marambio Island, Antarctica, about 1550 m south of López de Bertodano Bay. Klb9 unit, López de Bertodano Formation (Macellari, 1984), latest Maastrichtian.

• bed-level stratigraphic resolution

Environment/lithology: platform or shelf-margin reef; poorly lithified, gray, yellow, sandy siltstone

• Comprising mainly friable sandy siltstones with a yellow to grey color, variable in hardness, but relatively constant in grain size and mud percentage (Macellari, 1988). The age of this formation was assigned by the latter author to the Maastrichtian-Paleocene, based on mollusks (Zinsmeister, 1979; 1982), microfossils

•(Huber, 1988) and palynomorphs (Askin, 1989), and thereafter constrained to the latest Maastrichtian based on different stratigraphic criteria (Crame et al., 2004). The López de Bertodano Formation was divided into 10 informal units (Macellari, 1984; 1988), named from base to roof as Klb1 to Klb9 which are late Maastrichtian in age, while the uppermost KTplb10 includes strata of Paleocene age. Specimen SGO.PV.6523 was recovered from the upper portion of the Klb9 unit

Size class: macrofossils

• SGO.PV.6523: Postcranial remains of a single adult individual, including remains of 9 mid-to-posterior cervical vertebrae (6 of them preserving parts of their centra), the right scapula, several fragments of ribs and gastralia, and one phalanx.

Collected by RAO (author) in 2011; reposited in the MLP

Collection methods: surface (in situ), mechanical,

Primary reference: R. A. Otero, S. Soto-Acuña, A. O. Vargas, D. Rubilar-Rogers, R. E. Yury-Yanez and C. S. Gutstein. 2013. Additions to the diversity of elasmosaurid plesiosaurs from the Upper Cretaceous of Antarctica. Gondwana Research 26(2):722-734 [P. Mannion/J. Tennant/F. Aspromonte]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 149632: authorized by Philip Mannion, entered by Jonathan Tennant on 18.08.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Plesiosauria - Elasmosauridae
Elasmosauridae indet.
Elasmosauridae indet. Cope 1869 elasmosaur
SGO.PV.6523, postcranial remains of a single adult individual, including remains of 9 mid-to-posterior cervical vertebrae (6 of them preserving parts of their centra), the right scapula, several fragments of ribs and gastralia, and one phalanx.