首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Calcareous nannofossil response to the Valanginian Weissert event in a Boreal epicontinental sea
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Calcareous nannofossil response to the Valanginian Weissert event in a Boreal epicontinental sea

机译:钙质Nannofossil对Boreal Chicontinental Hea的瓦朗尼亚Weissert活动的反应

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摘要

During most of the Cretaceous, northern Germany was covered by a relatively shallow epicontinental sea. In the earliest Cretaceous (Berriasian; 145-139.4 myr), however, a phase of widespread regression caused nonmarine conditions to prevail in this area. The onset of the early Valanginian transgression re-established marine conditions in the Lower Saxony Basin (northwest Germany). Coccolithophores appeared in the basin in the late Berriasian and became abundant and diverse only in the late Valanginian (139.4-133.9 myr).
机译:在大多数白垩纪,德国北部被相对较浅的近海大海覆盖。 然而,在最早的白垩纪(Berriasian; 145-139.4 Myr),广泛的回归相阶段导致非甲状腺条件在该地区占上风。 瓦朗尼亚早期的近萨克森河盆地(德国西北)重新建立了海洋病程的发病。 Coccolithophores出现在后期Berriasian的盆地中,只有在瓦朗尼亚后期(139.4-133.9 MYR)中才丰富多样。

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