Characterization of Dichotomoceras in the Oxfordian of Kachchh |
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| Authors: | Jai Krishna Bindhyachal Pandey and Deo Brat Pathak |
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| Institution: | (1) National Centre for Antarctic and Ocean Research, Vasco da Gama, Goa, 403804, India;(2) Centre for Climate Change Research, IITM, Pune, 411008, India |
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| Abstract: | We report here the first Dichotomoceras of the Indian subcontinent at Kantkote (Wagad) in the proximal most exposed part of the Kachchh Basin. This is further addition
to the significant enlargement of the Oxfordian ammonoid record made earlier (Krishna et al. 1994, 1995, 1998, 2000). Near
continuous presence of ammonoids has been recorded in ca 55 m thick succession, almost immediately above the Schilli Subzone,
that was considered ammonoid devoid earlier. The ammonoid density, diversity and frequency in this just discovered ca 55 m
thick column are much scarcer in comparison to the underlying 10 m thick ammonoid abundant Schilli Subzone.
Examples of Dichotomoceras are determined almost throughout the said interval which in our preliminary taxonomic evaluation appear identical or close
to D. rotoides (Ronch.), D. stenocycloides (Siem.), D. bifurcatus (Quenst.) and D. crassus Enay. It thus suggests the characterization of the Rotoides Subzone of the Transversarium Zone and the superjacent Bifurcatus
Zone of the column at least up to the early Late Oxfordian. |
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