New Bathonian (Middle Jurassic) ammonite assemblages from Kutch,India |
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| Institution: | 1. CONICET – Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, División Paleoinvertebrados, Av. Ángel Gallardo 470 (C1405DJR), Buenos Aires, Argentina;2. CONICET ? Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, División Paleontología de Vertebrados, Av. Ángel Gallardo 470 (C1405DJR), Buenos Aires, Argentina |
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| Abstract: | The Bathonian ammonite assemblages have been previously poorly recorded in Kutch. The present study has unearthed a rich array of ammonite taxa ranging from the Middle to Upper Bathonian. While Oxycerites Rollier (1909) is a new record from Kutch, the oldest occurrence of Choffatia Siemiradzki (1898) has been found from the Middle Bathonian horizon. Oxycerites cf. orbis (Giebel) is a zonal index of the Late Bathonian in other areas and thus facilitates interprovincial correlation. Besides, palaeobiogeographic and stratigraphic distribution of many species have been modified based on new information. For example, macrocephalitin species, i.e., Kamptokephalites cf. etheridgei Spath (1928), Macrocephalites bifurcatus transient intermedius Spath (1928), M. cf. mantataranus Boehm (1912) were previously known from West Pacific, Indonesia have been now found in Kutch. Gracilisphinctes Buckman (1920) has been previously known to occur during the Middle Bathonian time, the present work extends its stratigraphic distribution up to the definite Upper Bathonian horizon. Procerites hians (Waagen) an endemic species in Kutch previously known from the Upper Bathonian beds, its stratigraphic range has been extended down to the Middle Bathonian.Detail taxonomy of the newly obtained taxa has been done and in many cases sexual dimorphism has been recognized. |
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