Campanian to Paleocene palynological succession of Seymour and adjacent islands, northeastern Antarctic Peninsula

Similarities of the K/Pc dinoflagellate cyst associations between South Atlantic and Indian proto-oceans

“…T. xanthiopyxides (Figures 2, 3, 4F and Tables 1, 2B) is reported from Late Cretaceous of New Zealand, (Roncaglia et al, 1999) and in Southern Kerguelen Plateau (Mao and Mohr, 1992). In Antarctica, this species occurs at the K/Pg boundary (Askin, 1988;Bowman et al, 2015). In Argentina, Guerstein and Junciel (2001) recorded it in the Paleocene.…”

“…cretacea and Trichodinium castanea are recorded in Australia (Helby et al, 1987) and Antarctica (Amenábar et al, 2014), but in other basins only Manumiella? cretacea and Trichodinium castanea are reported (Askin, 1988;Di Pasquo and Martin, 2013;Castro and Carvalho, 2015). Isabelidinium pellucidum is reported from New Zealand (Roncaglia et al, 1999;Schiøler et al, 2002), whereas in Argentina, Manumiella?…”

“…Micropaleontological data for the Lopez de Bertodano Formation (late Campanian-Maastrichtian) and Sobral Formation (early Paleocene) depict dinoflagellate cyst blooms in low salinity estuarine environments or under a closed bay condition with probable deposition in calm nearshore marine waters (Askin, 1988).…”

The Cretaceous and Paleocene pleurotomariid (Gastropoda: Vetigastropoda) fauna of Seymour Island, Antarctica

“…However, there does appear to be an increase in the species richness of the pleurotomariid fauna of Seymour Island during the Paleocene. The pattern of diversification immediately following the K/T extinction in Antarctic faunas has been previously observed in the gastropod genus Seymourosphaera (Oleinik and Zinsmeister, 1996) as well as in palynomorphs (Askin, 1988), diatoms, and silicoflagellates (Harwood, 1988). The pleurotomariid fauna of the Late Maastrichtian Miria Formation of Northwestern Australia, which was contemporaneous with the Lopez de Bertodano Formation of Seymour Island, consisted of two species of Conotomaria and a single species of Leptomaria (Darragh and Kendrick, 1994).…”

“…Corals, brachiopods, annelid tubes, scaphopods, decapods, echinoderms, marine reptiles and fishes are locally abundant. An early Paleocene (Danian stage) age of the Sobral Formation has been established based on the dinoflagellates (Hall, 1977), planktonic and benthic foraminifers (Huber, 1988;Palmarczuk et al, 1984), and spores and pollen (Askin, 1988), as well as on radiometric dating of glauconite (Macellari, 1984 Diagnosis.-''Conical or cyrtoconoid, anomphalous to broadly phaneromphalous; whorls weakly to strongly convex, not angular, last one rounded at periphery of convex base; selenizone at mid-whorl; ornament spiral threads that may be cancellated by collabral threads. Middle Jurassic (Bajocian) to Upper Cretaceous (Danian).…”