Abstract The Paleogene sections of Kutch are the reference for the regional chronostratigraphic units of India. The ages of these dominantly shallow marine carbonates are mainly based on larger benthic foraminifera (LBF). The taxonomic revisions of the LBF and the progressively refined shallow benthic zonations (SBZ) have necessitated the present study on updating the stratigraphy of the area. The sedimentation in Kutch commenced with the deposition of volcaniclastics in terrestrial environments in the Paleocene. The marine transgression in SBZ 5/6 deposited finer clastics and carbonates, designated as Naredi Formation, in early Eocene. There is no evidence of marine Paleocene in Kutch. A major hiatus spanning SBZ 12 to SBZ 16 was followed by the development of a carbonate platform and deposition of Harudi Formation – Fulra Limestone during the Bartonian, SBZ 17. The hiatus corresponds to a widespread stratigraphic break in Pakistan and India to Australia, referred as the ‘Lutetian Gap.’ The Maniyara Fort Formation is assigned to SBZ 22 B and SBZ 23, and its age is revised to Chattian. Climate played a major role in building up of the Paleogene stratigraphic succession of Kutch, the carbonates formed during the warming intervals and the stratigraphic gaps were in the intervening cooling periods.

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印度库奇古近系地层学：有孔虫生物地层学进展的最新进展

摘要 卡奇古近系剖面是印度区域年代地层单元的参考。这些占主导地位的浅海碳酸盐岩的年龄主要基于较大的底栖有孔虫（LBF）。LBF 的分类学修订和逐渐细化的浅底分带 (SBZ) 使得本研究有必要更新该地区的地层。Kutch 的沉积始于古新世陆地环境中火山碎屑的沉积。在始新世早期，SBZ 5/6 的海侵沉积了更细的碎屑和碳酸盐，命名为 Naredi 组。在卡奇没有海洋古新世的证据。SBZ 12 至 SBZ 16 的主要中断之后是碳酸盐台地的发育和 Harudi 组的沉积 - SBZ 17 巴顿阶期间的 Fulra 石灰岩。 该中断对应于巴基斯坦和印度到澳大利亚的广泛地层断裂，称为'Lutetian Gap'。Maniyara Fort Formation 被分配到 SBZ 22 B 和 SBZ 23，并且其年龄被修改为 Chattian。气候对卡奇古近系地层序列的形成起到了重要作用，碳酸盐岩形成于变暖期，地层间隙处于冷却期。并将其年龄修改为 Chattian。气候对卡奇古近系地层序列的形成起到了重要作用，碳酸盐岩形成于变暖期，地层间隙处于冷却期。并且它的年龄被修改为Chattian。气候对卡奇古近系地层序列的形成起到了重要作用，碳酸盐岩形成于暖期，地层间隙处于冷却期。