Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Kalyanbrata Daitai ¹, Debasish Bhaumik ², Sudipta K. Jana ², Subhendu Bardhan ²

Affiliations
1 Oil and Natural Gas Commission, Ankleshwar-393 010, IN
2 Department of Geological Sciences, Jadavpur University, Calcutta-700 032, IN

Abstract

Macrocephalites triangularis Spath is the oldest macrocephalitid species in Kutch. Judging from the associated taxa and comparison of similar macrocephalitids and other forms between Kutch and other parts of the world, a Late Bathonian age for M. triangularis is reaffirmed. Previous systematic description was based on only two specimens. A fair number of well preserved specimens has enabled us to trace the ontogenetic development and decipher sexual dimorphism. The importance of this species in the evolution of later rnacrocephalitids of Kutch is explored.

Keywords

Macroceplullites (Ammonoidea), Bathonian, Palaeontology, Kutch, Gujarat.

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