Late Maastrichtian-Danian nannoplankton from basal Subathu of Dharampur, Simla Himalaya, India-Palaeogeographic implications

Syed A. Jafar; P. Kapoor

doi:10.54991/jop.1988.1605

Authors

Syed A. Jafar Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India
P. Kapoor Geology Section, Oil and Natural Gas Commission, Tripura Project, Agartala 699014, India

DOI:

https://doi.org/10.54991/jop.1988.1605

Keywords:

Calcareous nannoplankton, Palaeogeography, Cretaceous, Simla Hills (India)

Abstract

The discovery of Danian calcareous nannoplankton of combined NP3-NP4: Chiasmolithus danicus/Ellipsolithus macellus zones from apparently unproductive Subathu of Dharampur, offers new scope for high resolution dating; reworked nannofloral elements of Late Maastrichtian (Micula mura Zone of low-mid latitudes) demand the fixing of lower age limit of Subathu Formation straddling K/T boundary. This may signify an event permitting the entry of Assam-Arakan sea along the lesser Himalayan rift via Arunachal during Late Maastrichtian.

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