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首页> 外文期刊>Journal of the Geological Society of India >Guembelitria (foraminifera) in the upper cretaceous-lower paleocene succession of the Langpar Formation, India and its paleoenvironmental implication
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Guembelitria (foraminifera) in the upper cretaceous-lower paleocene succession of the Langpar Formation, India and its paleoenvironmental implication

机译：印度Langpar组上白垩统-下古新统的Guembelitria（foraminifera）及其古环境意义

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摘要

Guembelitria is an essential biotic component in the Late Cretaceous-Early Paleogene (K/Pg) marine successions to provide crucial information about the K/Pg boundary; however, it is not well studied in Indian subcontinent. Biostratigraphically well constrained K/Pg successions of Therriaghat and Mahadeo in the East Khasi Hills District, Meghalaya, India provided a scope to present a comprehensive account of the genus in the perspective of differences of opinion about its species. A total of six species including Guembelitria langparensis n. sp., are recognized and their stratigraphic distribution is recorded. A review of the taxonomic validity of the known species, an evaluation of the diverse concepts of Guembelitria cretacea Cushman, and semiquantitative analysis of the recovered species permitted their clustering into two morphogroups that had different ecology. Morphogroup I comprising Guembelitria cretacea, Guembelitria trifolia and Guembelitria langparensis n. sp., is characterized by flared and short spire tests that form a bioseries and thrived as surface floaters. Morphogroup II comprising Guembelitria irregularis, Guembelitria danica and Guembelitria sp a, possesses high spire, narrow tests that have morphological abnormalities and had preference for living in subsurface stressed environment. The occurrence of the species and accompanying other features like ratio of planktonic to benthic foraminifera (p/b), lithologic assemblage and incidence of phosphorite, are used to infer depositional environments and sea level changes during successive biozones of the sequence. The recognized Guembelitria events during the K/Pg transition are discussed with reference to world occurrences.
机译：Guembelitria是晚白垩世-早古海洋（K / Pg）海洋演替过程中必不可少的生物成分，可提供有关K / Pg边界的重要信息；但是，在印度次大陆尚无很好的研究。在印度梅加拉亚邦东卡西山丘地区，Therriaghat和Mahadeo受到地层学方面的严格限制，K / Pg演替提供了一个机会，可以从对该物种的观点分歧的角度全面介绍该属。总共有6个物种，包括郎贝特兰guparbelitria地层，并记录其地层分布。对已知物种的分类学有效性进行回顾，评估瓜氏菌的多样性概念，并对回收的物种进行半定量分析，从而将其聚类为两个具有不同生态学的形态群。形态群I包括白屈菊，白屈菊和langparensis n。 sp。的特征是形成生物系列并发展成表面漂浮物的喇叭形和短尖顶测试。包含不规则Guembelitria，Guembelitria danica和Guembelitria sp a的Morphogroup II具有较高的尖顶，狭窄的测试，这些测试具有形态异常，并且偏爱生活在地下压力环境中。该物种的出现以及伴随的其他特征（如浮游与底栖有孔虫的比率（p / b），岩性组合和磷矿的发生）被用于推断该层序的连续生物带中的沉积环境和海平面变化。参照世界发生情况，讨论了在K / Pg转变过程中公认的Guembelitria事件。

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