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Journal of the Geological Society of India

, Volume 77, Issue 4, pp 328–348 | Cite as

Selachian fishes from Bhuban Formation, Surma Group, Aizawl, Mizoram

  • Victor Zochhuana Ralte
  • R. P. Tiwari
  • Lalchawimawii
  • J. Malsawma
Article

Abstract

An interesting selachian fish assemblage having stratigraphic and palaeoecological significance is being described from the two intraformational calcareous conglomeratic horizons within the Upper Bhuban unit of Bhuban Formation, Surma Group (Lower to Middle Miocene). The assemblage consists of eighteen species of selachian fishes including two new ones (Carcharhinus bhubanicus and Hemipristis unidenticulata) belonging to thirteen genera and another thirteen forms have been identified up to generic level. It is dominated by the families Carcharhinidae and Lamnidae, and is one of the most diversified Miocene assemblages from the Indian subcontinent. The fish fauna and the associated mega-invertebrates suggest Lower Miocene (Aquitanian - Burdigalian) age for the Upper Bhuban unit of Bhuban Formation. These further suggest that the fish yielding horizons were deposited under a warm shallow marine set-up near to the shoreline in a high-energy environment.

Keywords

Selachian fauna Lower Miocene Bhuban Formation Surma Group Mizoram 

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Copyright information

© Geological Society of India 2011

Authors and Affiliations

  • Victor Zochhuana Ralte
    • 1
  • R. P. Tiwari
    • 1
  • Lalchawimawii
    • 1
  • J. Malsawma
    • 1
  1. 1.Department of GeologyMizoram UniversityAizawlIndia

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