1. Eocene foraminifers of the Naga Hills of Manipur, Indo-Myanmar Range (IMR): Implications on age and basin evolution.
- Author
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Lokho, Kapesa, Aitchison, Jonathan C., Whiso, Kezhakielie, Lhoupenyi, David, Zhou, Renjie, and Raju, D.S.N.
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FORAMINIFERA , *CLASTIC rocks , *AGE groups , *SEDIMENTARY rocks , *ANOXIC zones , *EOCENE Epoch - Abstract
• Eocene foraminifers study has been carried out in the Naga Hills of Manipur to refine biostratigraphic age and depositional setting. • A biostratigraphic age ranging from Planktonic Foraminiferal Zones E14-E16 is inferred for the Upper Disang Formation. • The depositional setting is suggested of upper bathyal zone within an anoxic, rapidly-shallowing basin. The Disang Group incorporates the oldest Cenozoic clastic sedimentary rocks that crop out in a series of NNE–SSW trending ridges and valleys throughout much of the Naga Hills. The stratigraphic position of this unit is not well constrained due to a paucity of definitively recognisable, in situ fossils. We report forty-four species attributable of twenty-eight genera. Based on our new reported foraminiferal assemblages, we refine the age and paleoenvironmental interpretations for the Upper Disang Formation. We recognize Planktonic Foraminiferal Zones E14-16 correlative to upper middle Eocene to upper Eocene in the Upper Disang Formation within the Naga Hills. A basin model for this lithological unit involving an upper bathyal bathymetry, rapidly shallowing in a restricted basin with slump deposits where anoxic conditions prevailed is proposed based on field observations, foraminiferal assemblages, and published data. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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