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首页> 外文期刊>Geodinamica Acta >Early Bartonian orthophragminids (Foraminiferida) from Reineche Limestone, north African platform, Tunisia: taxonomy and paleobiogeographic implications
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Early Bartonian orthophragminids (Foraminiferida) from Reineche Limestone, north African platform, Tunisia: taxonomy and paleobiogeographic implications

机译：来自突尼斯北部非洲台地的雷尼什石灰岩的早期Bartonian角砾岩（有孔虫科）：分类学和古生物地理学意义

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摘要

The orthophragminids in lower Bartonian Reineche Limestone member, a fossiliferous shallow-marine unit exposed in Cap Bon peninsula in Tunisia, are represented by 17 species assigned to Discocyclinidae Galloway 1928 and Orbitoclypeidae Br?nnimann 1946. These taxa, associated with nummulitids and alveolinids, belong to the lineages of Discocyclina Gümbel 1870, Nemkovella, 1987, Orbitoclypeus Silvestri 1907, and Asterocyclina Gümbel 1870, described for the first time from north Africa lying at the southern margin of Tethyan ocean during Paleogene. We identified Nemkovella evae, previously not recorded in upper Lutetian/lower Bartonian and younger Eocene deposits of northern Tethyan platforms, and erected a new subspecies, N. evae reinechensis n. ssp. A comparison of Reineche orthophraminids, assigned to orthophragmines zone (OZ) 12 and shallow benthic zone (SBZ 17),to the well-described coeval assemblages at northern Tethyan platforms in Italy, Hungary, Turkey, and to those in Kutch Basin in the Indian subcontinent suggests that some species are confined to certain paleogeographic domains. Orbitoclypeus haynesi, the only orbitoclypeid and the most abundant orthophragminid in lower Bartonian deposits in Kutch,appears to be the most common orbitoclypeid in Reineche Limestone. In Europe, this species is not known and is replaced by Orbitoclypeus varians, the most common orbitoclypeid in middle Eocene of central Europe. Both species occur in varying proportions in marine successions in Turkey. Asterocyclina sireli, identified so far only in Turkey, occurs in Reineche Limestone and in lower Bartonian deposits in Kutch. This species is recorded for the first time in the Indian subcontinent. Relying on present study, as well as our recent studies in Kutch Basin, we conclude that the generic and specific diversity of orthophragminids decreases eastward from the peri-Mediterranean region to Indian subcontinent and to the western Pacific.
机译：在突尼斯的Cap Bon半岛暴露的化石浅海单元Bartonian Reineche Limestone成员中的直生眼螨目，由分配给Discocyclinidae Galloway 1928和Orbitoclypeidae Br？nnimann 1946的17个物种代表。根据DiscocyclinaGümbel1870，Nemkovella，1987，Orbitoclypeus Silvestri 1907和AsterocyclinaGümbel1870的血统，在北非第一次描述于北非，位于特提斯洋南缘。我们确定了Nemkovella evae，以前没有记录在特提斯山北部平台的Lutetian / Bartonian下部和较新世的较年轻沉积物中，并建立了一个新的亚种N. evae reinechensis n。 ssp。分别归入邻苯丙胺类（OZ）12和浅底栖生物区（SBZ 17）的Reineche邻苯二甲酰胺与意大利，匈牙利，土耳其北部特提斯月台以及印度印度Kutch盆地中描述的同等组合次大陆表明，某些物种仅限于某些古地理域。哈奇（Haynesi）眶骨科动物，是库奇（Kutch）下部巴顿阶沉积物中唯一的眶骨科动物和最丰富的直生藻科动物，似乎是雷内什石灰岩中最常见的眶科动物。在欧洲，该物种尚不知道，并被中欧始新世最常见的眶二倍体Orbitoclypeus varians取代。两种物种在土耳其的海洋演替中都有不同的比例。 Asterocyclina sireli迄今仅在土耳其被发现，发生在Reineche Limestone和Kutch的Bartonian低层矿床中。该物种在印度次大陆上首次被记录。根据目前的研究以及我们在库奇盆地的最新研究，我们得出结论，邻地中海藻类的种类和特定多样性从地中海沿岸地区向印度次大陆和西太平洋向东递减。

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