Small Antarctic Late Cretaceous chorate dinoflagellate cysts: biological and palaeoenvironmental affinities

Abstract

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

“…Isabelidinium pellucidum, Manumiella? 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).…”

“…Paleocystodinium lidiae (Figures 2, 4M, and Tables 1, 2B) is restricted to Antarctica (Amenábar et al, 2014) and South America: Argentina) during the Late Cretaceous (Guerstein and Junciel, 2001), Late Cretaceous-Paleocene of Uruguay (Daners and Guerstein, 2004), Brazil (Pelotas Basin) in the K/Pc boundary and Paleocene (Fischer et al, 2013;Menezes, 2014). In other Brazilian marginal basins such as Almada and Sergipe (Arai, 2007;Ferreira, 2004) its presence is noted during the Cretaceous and Paleocene.…”

Intermittent euxinia in the high-latitude James Ross Basin during the latest Cretaceous and earliest Paleocene

“…Large-scale blooms of the dinoflagellate cyst Impletosphaeridium clavus in the LBF have been linked to the decay of ephemeral sea ice during short-lived 'cold snaps' (Bowman et al, 2013) correlated to isotopic evidence for cool ocean temperatures (Tobin et al, 2012;Petersen et al, 2016). Others have suggested that these blooms are related to periods of higher continental nutrient influx and eutrophication, without the need to invoke sea ice formation (Amenábar et al, 2014). With or without sea ice, anoxic conditions were likely dynamically driven by seasonal bursts of high productivity, with their magnitude determined by the accumulation of a standing stock of dissolved nutrients during the polar winter.…”

A new species of small acritarch with a porous wall structure from the early Cambrian of Estonia and implications for the fossil record of eukaryotic picoplankton

“…5-10 μm in diameter, was first used by Habib & Knapp (1982) in the detailed SEM study of the Cretaceous assemblage from the Deep Sea Drilling Project in the western North Atlantic. However, such minute taxa have been known from the Cambrian (Volkova 1968;Vanguestaine 1974;Fombella 1979Fombella , 1986Vavrdová 1982;Moczydłowska 1991;, Palaeozoic (Tappan & Loeblich 1973;Loeblich & Wicander 1976;Playford 1981;Colbath 1983;Parsons et al 2000;Le Hérissé 2002), and Mesozoic-Cenozoic (Habib & Knapp 1982;Shrank 2003;Lei et al 2013;Amenábar et al 2014). Presence of the poorly-resolved small acritarch Micrhystridium throughout Phanerozoic strata is also interesting.…”