Selachian fishes from Bhuban Formation,Surma Group,Aizawl, Mizoram |
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| Authors: | Victor Zochhuana Ralte R P Tiwari Lalchawimawii J Malsawma |
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| Institution: | (1) Department of Engineering Geology and Hydrogeology, RWTH Aachen University, Lochnerstr 4-20, 52064 Aachen, Germany;(2) Department of Civil Engineering, National Institute of Technology, Rourkela, 769008 Orissa, India |
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| 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. |
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