A new fossil Adamussium (Bivalvia: Pectinidae) from Antarctica

Abstract

Adamussium jonkersi sp. nov. is described from the Late Oligocene Destruc− tion Bay Formation, Wrona Buttress area, King George Island (South Shetlands), West Antarctica. The unit, characterized by volcanic sandstone, is a shallow marine succession deposited in a moderate− to high−energy environment. The thin−shelled pectinids, col− lected from the lower part of the unit, are preserved mostly as complete valves. Shell thickness, sculpture pattern and umbonal angle suggest a free−living, inactive swimming life habit.

EarlyMioceneMollusca fromMcMurdoSound,Antarctica (ANDRILL2Adrill core), with a review ofAntarcticOligocene andNeogenePectinidae (Bivalvia)

“…The first five of the included species (listed below) were compared in a useful table by Quaglio et al . (, p. 297, table ). The table is repeated here, slightly simplified (Table ); the last species listed below is too incomplete to include.…”

“…Diatom, dinoflagellate and calcareous nannofossil biostratigraphy and 40 Ar/ 39 Ar dating of lavas have been used to date the scallop‐bearing formations of King George Island, Antarctic Peninsula: Oligocene (Polonez Cove Formation, Low Head and Oberek Cliff Members, Early Oligocene, late Rupelian; Destruction Bay Formation, Late Oligocene, Chattian) and Early Miocene, Aquitanian (Cape Melville Formation; Birkenmajer and Gazdzicki ; Jonkers ; Quaglio et al . , , fig. ).…”

“…, p. 96): 740.84–740.86 mbsf: Adamussium cf. jonkersi Quaglio, Whittle, Gazdzicki and Simões, (Fig. A), internal mould of LV; anterior third of valve.…”

“…Adamussium jonkersi Quaglio et al ., , Destruction Bay Formation (Late Oligocene, Chattian), King George Island; tentatively in ANDRILL 2A.…”

Rare calcareous microfossils from Middle Miocene strata, Weddell Sea off Antarctic Peninsula

“…Ostracods have been described from only some of these localities, includ− ing Eocene strata of Seymour Island (Szczechura 2001), Oligocene strata of the Polonez Cove Formation on King George Island (Błaszyk 1987), and Pliocene strata of Cockburn Island (Szczechura and Błaszyk 1996). Bivalves and gastro− pods are known mostly from Eocene strata of Seymour Island (Stilwell and Zinsmeister 1992, and references therein) and from Miocene strata of King George Island (Karczewski 1987;Quaglio et al 2010).…”