• First discovery of fossil winged seeds of Pinus L. (family Pinaceae) from the Indian Cenozoic and its palaeobiogeographic significance

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      https://www.ias.ac.in/article/fulltext/jess/126/05/0063

    • Keywords

       

      Pinus; winged seeds; middle-to-late Miocene; Siwaliks; palaeobiogeography; Arunachal Pradesh; biogeosciences; climate; geology.

    • Abstract

       

      The occurrences of Pinus L. (family Pinaceae) megafossils (cones and leaf remains) have been abundantly documented from the Cenozoic sediments of eastern Asia (Japan and China), but none has been confirmed from the Indian Cenozoic till date. Here, we describe Pinus arunachalensis Khan and Bera, sp. nov. on the basis of seed remains from the middle to late Miocene Siwalik sediments of the Dafla Formation exposed around West Kameng district in Arunachal Pradesh, eastern Himalaya. Seeds are winged, broadly oblong to oval in outline, 1.3–1.5 cm long and 0.4–0.6 cm broad (in the middle part), located basipetally and symmetrically to wing, cellular pattern of wing is seemingly undulatory and parallel with the long axis of the wing. So far, this report provides the first ever fossil record of Pinus winged seeds from India. This record suggests that Pinus was an important component of tropical-subtropical evergreen forest in the area during the Miocene and this group subsequently declined from the local vegetation probably because of the gradual intensification of MSI (monsoon index) from the Miocene to the present. We also review the historical phytogeography and highlight the phytogeographic implication of this genus.

    • Author Affiliations

       

      Mahasin Ali Khan1 Subir Bera2

      1. Department of Botany, Sidho-Kanho-Birsha University, Ranchi Road, Purulia 723 104, India.
      2. Department of Botany, Centre of Advanced Study, University of Calcutta, 35 B.C. Road, Kolkata 700 019, India.
    • Dates

       
  • Journal of Earth System Science | News

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