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Palynological investigation of Neogene (Early Miocene) sediments of Mangalore basin, India: Palaeoenvironmental and palaeoclimatic implications

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Journal of the Geological Society of India

Abstract

A rich palynological assemblage consisting of algal remains (5 genera and 7 species, including dinoflagellate cysts), fungal spores (2 genera and 3 species), pteridophytic spores (5 genera and 8 species), gymnospermous pollen grains (3 genera and 3 species) and angiospermous pollen grains (17 genera and 22 species) has been recorded for the first time from the Miocene sediments exposed along Kullur-Kavur road, near Mangalore along the west coast of Karnataka. Among the important genera are: Achomosphaera, Leptodinium, Staphlosporonites, Hammenisporis, Polypodiaceaesporites, Quilonipollenites, Myricipites, Graminidites, Malvacearumpollis, Palaeomalvaceaepollis and Chenopodipollis. Qualitative and quantitative analyses reveal that the angiosperm pollen grains are dominant over pteridophytic spores and an overall, a warm and humid tropical-sub-tropical coastal climate with heavy precipitation is suggested for the site of deposition. The sediments were deposited in fluctuating conditions ranging from lacustrine to marine environments with fresh water swamps and ponds nearby. The occurrence of Hammenisporis, Polypodiaceaesporites, Quilonipollenites, Myricipites, Graminidites, Malvacearumpollis, Palaeomalvaceaepollis and Chenopodipollis in the present assemblage suggests an early Miocene age. A comparison of the present palynofloral assemblage with those known from the Indian Tertiary sediments shows its close resemblances with the Miocene palynoflora recovered from Quilon and Warkalli beds of Kerala basin.

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Rao, M.R., Verma, P. Palynological investigation of Neogene (Early Miocene) sediments of Mangalore basin, India: Palaeoenvironmental and palaeoclimatic implications. J Geol Soc India 84, 55–67 (2014). https://doi.org/10.1007/s12594-014-0110-6

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