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首页> 外文期刊>Alcheringa: An Australasian Journal of Palaeontology >A new early paleocene dinoflagellate cyst species, trithyrodinium partridgei: Its biostratigraphic significance and palaeoecology
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A new early paleocene dinoflagellate cyst species, trithyrodinium partridgei: Its biostratigraphic significance and palaeoecology

机译：一种新的古新世早鞭毛藻囊肿种，三甲状腺rod（Trithyrodinium partridgei）：其生物地层学意义和古生态学

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摘要

A palynological investigation of lower Paleocene (lower Teurian) marine sediments of the Abbotsford Formation, exposed in the Fairfield Quarry, Dunedin, New Zealand, reveals a well-preserved association of dinoflagellate cysts and miospores. Thirty-six dinoflagellate species representing 26 genera were recorded, including one new peridinioid dinoflagellate species, Trithyrodinium partridgei characterized by a three-layered wall and a distinct brown, foveolate mesophragm. Trithyrodinium partridgei has a narrow range and at Fairfield Quarry co-occurs with typical New Zealand late Danian to Selandian index species such as Glaphyrocysta perforata and Alterbidinium pentaradiatum; hence it may prove an additional useful stratigraphic marker. The terrestrial palynomorph assemblage from samples within the range of Trithyrodinium partridgei includes 36 spore-pollen species dominated by the podocarp pollen Phyllocladidites mawsonii. The presence of Nothofagidites waipawaensis and Tricolpites phillipsii confirms a Paleocene age for the assemblage. The abundance of terrestrial palynomorphs and the composition of the dinocyst assemblages suggest a marine nearshore depositional environment.
机译：对暴露于新西兰达尼丁费尔菲尔德采石场的阿伯茨福德组下古新世（下图尔二世）下层海相沉积物进行的孢粉学调查显示，保存完好的鞭毛囊孢子囊和微孢子囊存在着联系。记录了代表26个属的36种鞭毛鞭毛藻物种，包括一种新的蛇皮类鞭毛鞭毛藻，其特征是三层壁和一个明显的棕色凹状中生膜。 Trithyrodinium partridgei的范围很窄，在Fairfield Quarry与典型的新西兰晚期Danian至Selandian索引物种同时出现，例如穿孔的Glaphyrocysta perforata和Alterbidinium pentaradiatum。因此，它可能被证明是另外一个有用的地层标记。 part粉范围内的样品的陆地类孢粉组合包括36种孢子花粉种，其中罗汉果花粉为毛竹叶藻。 waipawaensis Nothofagidites和phillipsii Tricolpites的存在证实了该组合的古新世。陆地上的拟苔藓类植物丰富，并且恐龙囊组合的组成表明存在海洋近岸沉积环境。

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