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首页> 外文期刊>Journal of Palaeogeography >Callovian–Oxfordian hecticoceratins from western India: Their biostratigraphic and palaeobiogeographic implications
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Callovian–Oxfordian hecticoceratins from western India: Their biostratigraphic and palaeobiogeographic implications

机译：印度西部Callovian–Oxfordian hecericoceratins：其生物地层学和古生物地理学意义

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Abstract The Kutch Basin of western India is famous for its rich assemblages of the Callovian–Oxfordian ammonites. The family Oppelidae Douvillé is the second most diverse ammonite group after perisphinctids during the Middle–Upper Jurassic. Hecticoceratinae is the most diverse subfamily within Oppelidae and has wide palaeobiogeographic (near cosmopolitan) and temporal distributions (Bathonian–Oxfordian). Some species were well time-diagnostic and thus help in interprovincial correlation. The taxonomy of the subfamily Hecticoceratinae of Kutch was in a state of flux until recently. It was not revised since Spath’s (1927–1933) great contribution. Many genera and species were morphogenera or morphospecies and they again suffer from excessive subjective splitting. It was therefore badly needed for a comprehensive taxonomic revision of the subfamily with modern aspects of systematics i.e., sexual dimorphism and population dynamics. A lithostratigraphic framework has already been well documented in the Kutch Basin of western India. A high resolution biostratigraphy incorporating stage-intrastage fossil assemblages have been used in interbasinal correlation based on the Callovian–Oxfordian hecticoceratins. Near cosmopolitan distribution of many hecticoceratin genera were widely used for biostratigraphic zonation as well as an understanding of the palaeobiogeographic pattern. The phylogeny of the subfamily Hecticoceratinae has been used to construct the cladograms depicting area relationships among different provinces during the Callovian–Oxfordian.
机译：摘要印度西部的库奇盆地以其丰富的卡洛夫-牛津ford石组成而闻名。 OppelidaeDouvillé家族是侏罗纪中上侏罗世之后仅次括约孢子虫第二大不同的am族。 Hecticoceratinatinae是Oppelidae中种类最多的亚科，具有广泛的古生物地理学（近世界性）和时间分布（巴松管－牛津）。一些物种具有良好的时间诊断性，因此有助于省际相关。直到最近，库奇氏菌科的亚科的分类学一直处于变化中。由于Spath（1927–1933）的杰出贡献，因此未进行任何修订。许多属和物种是形态发生或形态种，它们又遭受过度的主观分裂。因此，迫切需要对亚科进行全面的分类学修订，使其具有系统的现代方面，即性二态性​​和人口动态。在印度西部的库奇盆地，岩相地层格架已经得到了很好的记录。基于Callovian-Oxfordian hecticoceratins的高分辨率生物地层学结合了阶段内化石组合，已用于基层间的相关性。许多hecericoceratin属的近世界性分布被广泛用于生物地层分区以及对古生物地理模式的理解。 Hecticoceratinae亚科的系统发育已被用于构造枝形图，描绘了卡洛夫时期至牛津时期不同省份之间的区域关系。

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