Research paperThe thyra Ø flora: Toward an understanding of the climate and vegetation during the early tertiary in the high arctic
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Aponogeton pollen from the Cretaceous and Paleogene of North America and West Greenland: Implications for the origin and palaeobiogeography of the genus
2014, Review of Palaeobotany and PalynologyCitation Excerpt :The late Cretaceous North American fossil shares a pollen type (Pollen Type 3) with a purely tropical, Indomalayan–Australasian lineage leading to section Flavida that includes at least one Madagascan and one S.E. Asian species (Figs. 3–5; Fig. 7B, F), but no African species. Furthermore, the pollen types of two modern temperate species, Aponogeton distachyos and Aponogeton hexatepalus (Pollen Types 1 and 2) are not restricted to these species, but are also found in tropical Madagascan and S.E. Asian species (Fig. 7F), and middle Eocene North American and Greenland fossil assemblages (Fig. 7C) thriving under humid warm temperate (or subtropical) to tropical-like conditions (e.g. Boyd, 1990 [Greenland]; Graham, 1999 [North America]). Extant Aponogeton species are hydrochorically dispersed, tolerant against seasonal draught, but non-tolerant against salty water and low temperatures, hence, widening seaways and high mountain ranges are likely the primary barriers to the dispersal of the genus (red lines in Fig. 7).
A palynological study of an extinct arctic ecosystem from the Palaeocene of Northern Alaska
2011, Review of Palaeobotany and PalynologyCitation Excerpt :These findings suggest a markedly similar ecosystem structure for the Palaeocene of northern Alaska to that proposed by other palaeobotanical and palynological studies of the Cretaceous and Palaeogene of various other northern hemisphere localities. Notably these include the Canadian high Arctic (e.g. Burden and Langille, 1991; Francis, 1988, 1990; Jahren, 2007; McIver and Basinger, 1999; Williams et al., 2007), northern Greenland (Boyd, 1990), northeast Russia (Herman, 2007a; Herman et al., 2004; Spicer et al., 2002) and the North Atlantic Igneous Province (Boulter and Manum, 1989; Jolley, 1998; Jolley and Morton, 2007; Jolley and Whitham, 2004) pointing to a sustained period of dominance of such vegetation over an extended area of the boreal regions of the northern hemisphere and palaeoarctic. While this ‘palaeoarctic flora’ was clearly part of an extensive northern biome during the Palaeocene, it is apparent, at least on the North Slope of Alaska, that it was subject to a degree of evolution over an extended period of time.
Some limitations in using leaf physiognomic data as a precise method for determining paleoclimates with an example from the Late Cretaceous Pautût Flora of West Greenland
1994, Palaeogeography, Palaeoclimatology, PalaeoecologyTerrestrial palaeclimatology in the Tertiary: a methodological critique
1992, Palaeogeography, Palaeoclimatology, PalaeoecologyThermo-tectonic development of the wandel sea basin, north greenland
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