首页> 外文期刊>Geodinamica Acta >Bartonian orthophragminids from the Fulra Limestone (Kutch, W India) and coeval units in Sulaiman Range, Pakistan: a synthesis of shallow benthic zone (SBZ) 17 for the Indian Subcontinent
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Bartonian orthophragminids from the Fulra Limestone (Kutch, W India) and coeval units in Sulaiman Range, Pakistan: a synthesis of shallow benthic zone (SBZ) 17 for the Indian Subcontinent

机译:来自Fulra石灰石(印度W彻奇)和巴基斯坦Sulaiman山脉中的中世纪单位的Bartonian角砾岩:印度次大陆的浅底海底带(SBZ)17的合成

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摘要

Orthophragminids from the Bartonian Fulra Limestone in Kutch, India and the coeval units in Sulaiman Range in Pakistan suggest the establishment of a significant number of endemic species in the Indian subcontinent (Eastern Tethys). Among a total of fifteen species of Discocyclina , Orbitoclypeus and Asterocyclina , six of them appear to be confined to Indian subcontinent while seven species are common both to the peri-Mediterranean/Europe region (Western Tethys) and Indian subcontinent. Two species, Asterocyclina sireli , a four-ribbed species of possibly Indo-Pacific origin, and Orbitoclypeus haynesi that form large populations in Fulra Limestone, appear to have spread into North Africa and Turkey but not into European platforms as a response to Middle Eocene Climatic Optimum (MECO). The lack of Lutetian and Priabonian fauna in the studied sections, either due to a hiatus or unsuitable depositional environments, hampers the establishment of the actual stratigraphic ranges of the identified taxa. Our record provides us to characterize the orthophragminids in shallow benthic zone (SBZ) 17 for Eastern Tethys in detail by comparing the data from the above localities with those from the North Africa, Europe and Turkey, showing the change in diversity.
机译:来自印度Kutch的Bartonian Fulra Limestone的直生石斑鱼和巴基斯坦Sulaiman Range的远古时代的单位建议在印度次大陆(东特提斯)建立大量特有物种。在地中海沿岸的迪斯科比林纳,眶Or和星轮螺共15种中,其中6种似乎局限于印度次大陆,而地中海/欧洲地区(西特提斯)则共有7种和印度次大陆。在富拉石灰岩中形成大量种群的两种物种,即可能起源于印度太平洋的四肋鱼类,Asterocyclina sireli,和在富拉石灰岩中形成大量种群的 lybitoclypeus haynesi,似乎已经扩散到北非和土耳其,但没有扩散到欧洲平台上。对中始新世气候最佳(MECO)的响应。由于裂隙或不合适的沉积环境,研究区域缺少鲁特斯和普里伯尼动物区系,这阻碍了确定的分类单元的实际地层范围的建立。我们的记录通过比较上述地区的数据与北非,欧洲和土耳其的数据,显示了多样性的变化,从而使我们能够详细地描述特提斯东部浅层底栖动物带(SBZ)17的角鲨。

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