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Occurrence of foraminifera in Jurassic sediments of Jhurio Dome, Kutch, India: first report of species from the Indian region and preliminary interpretations regarding palaeoecology and age

Abstract

Middle to Late Jurassic rocks of Jhurio Dome, Kutch, India yielded fairly rich foraminiferal assemblages comprising 87 species, including 27 species reported for the first time from the Indian region which are illustrated with the help of SEM photomicrographs. Preliminary interpretations regarding palaeoecology and age are attempted. Based on the dominance of Family Vaginulinidae followed by Nodosariidae, Morphogroup J, calcareous hyaline species, and genus Lenticulina, the foraminiferal assemblages of Jhurio Dome appear to be flourishing in an open oceanic deep shelf environment, ranging from mid to outer shelf, with normal to high oxygen level and normal salinity. On the basis of foraminiferal assemblages, a Bajocian to Oxfordian age is assigned to the studied rocks of Jhurio Dome, Kutch, India.

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Fig. 1

(modified from Patel et al. 2012a)

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Abbreviations

m:

Meter

µm:

Micrometer/micron

SEM:

Scanning electron microscope

USIF:

University sophisticated instruments facility

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Acknowledgements

We are grateful to the Chairperson, Department of Geology, Aligarh Muslim University, Aligarh, India for providing laboratory facilities and Dr. Adnan Quasim, Assistant Professor in the same department, for encouragement during the course of the present investigations. Critical reviews and constructive suggestions provided by two anonymous reviewers are gratefully acknowledged which substantially improved the manuscript. Financial assistance for the present study was utilised by Maulana Azad National Fellowship (MANF) granted by University Grant Commission (UGC), India, which is gratefully acknowledged.

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All the authors contributed equal efforts in the field work, laboratory work and drafting the manuscript. AHA finalised all laboratory work (identification of microfaunal species, interpretations, etc.). All the authors have read and confirmed the final version of manuscript for the submission.

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Correspondence to Ainul H. Ansari.

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Ansari, A.H., Talib, A. & Kumar, A. Occurrence of foraminifera in Jurassic sediments of Jhurio Dome, Kutch, India: first report of species from the Indian region and preliminary interpretations regarding palaeoecology and age. J. Sediment. Environ. (2021). https://doi.org/10.1007/s43217-021-00077-0

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Keywords

  • Benthic foraminifera
  • Jurassic
  • Jhurio Dome
  • Kutch
  • Palaeoecology
  • Age