Abstract Micropaleontological studies of calcareous dinoflagellates, calpionellids and planktonic foraminifera have provided new knowledge on the stratigraphic age and detailed characteristics of the Lar Formation and the K u b rock unit in the Marghsoo section in the central Alborz Zone of northern Iran, within the Central Neo-Tethys region. The Colomisphaera fibrata, Cadosina parvula, Stomiosphaera moluccana, Cadosina semiradiata semiradiata, Colomisphaera tenuis, and Colomisphaera fortis calcareous dinoflagellate zones, ranging upper Oxfordian to upper Tithonian, have been identified in the Lar Formation, and calpionellid assemblages in the uppermost Lar Formation can be identified to the Tintinnopsella remanei Subzone of late Tithonian age. Poorly preserved planktonic foraminifera occur at a level assigned to upper Kimmeridgian. These observations document the opening of a major seaway connecting Iran to the Central Atlantic during late Kimmeridgian seafloor widening, to provide the pathway for planktonic foraminifera to migrate from the Central Atlantic to the Central Neo-Tethys of Iran in the late Kimmeridgian. Twelve species of Late Cretaceous planktonic foraminifera in the K u b rock unit indicates Dicarinella concavata Zone (uppermost Turonian to upper Coniacian), with close similarity to material described from the Central Atlantic, southern Europe and the Middle East.

中文翻译：

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新特提斯中部侏罗纪晚期至白垩纪晚期的海洋动物微化石：伊朗阿尔伯兹中部的案例研究

摘要 对钙质甲藻、毛藻和浮游有孔虫的微古生物学研究为伊朗北部 Alborz 带中部 Marghsoo 剖面 Lar 组和 Kub 岩单元的地层时代和详细特征提供了新的认识。特提斯地区。Colomisphaera fibrata、Cadosina parvula、Stomiosphaera moluccana、Cadosina semiradiata semiradiata、Colomisphaera tenuis 和 Colomisphaera fortis 钙质甲藻带，范围从牛津上层到 Tithonian 上层，已在 Lar 组中被识别，而calpionellid 地层中的 calpionellid 被确定为最上层的钙质甲藻到提通阶晚期的 Tintinnopsella remanei 亚带。保存不佳的浮游有孔虫出现在属于上基米里阶的水平。这些观测记录了在金米里纪晚期海底扩大期间连接伊朗和中大西洋的主要航道的开通，为浮游有孔虫在金米里纪晚期从中大西洋迁移到伊朗的新特提斯中部提供了途径。Kub 岩石单元中的 12 种晚白垩世浮游有孔虫表明 Dicarinella concavata 带（土伦阶至上康尼亚阶），与描述的来自中大西洋、南欧和中东的材料非常相似。