Abstract
The Bathonian occurrences of Indonesian Macrocephalites from the Kachchh basin (Western India) (and correspondingly the immigration of the genus into the basin) is evaluated in context of improved biostratigraphy and new ammonite data vis-à-vis European and Submediterranean records. The Indonesian Middle Bathonian macrocephalitids [Macrocephalites bifurcatus transient intermedius (Spath) (M), M. bifurcatus transient cf. intermedius (Spath) (M), M. bifurcatus transient aff. bifurcatus Boehm (m) and M. cf. etheridgei Spath (m)], have largely been recorded from a single dome, Jumara (from the basal Yellow bed, bed A4), with additional singular occurrences of M. cf. etheridgei Spath (m) from the adjoining Nara and Jhura domes (Kachchh). In Jumara, the Indonesian macrocephalitids are associated with Micromphalites (Clydomphalites) clydocromphalus Arkell (M), Procerites (Gracilisphinctes) arkelli Collignon (M), P. (G.) intermedius Jain (m), P. hians (Waagen) (M), Wagnericeras sp. (m), Parapatoceras distans (Baugier and Sauzé) (M), Sivajiceras congener (Waagen) (M and m), Macrocephalites triangularis Spath (M and m), Epimorphoceras decorum (Waagen) (M), and Reineckeia sp. A and B (M). This fauna is correlated with the European early Middle Bathonian Progracilis Zone. Both Jumara and the adjoining Jara domes have also yielded characteristic Indonesian Late Bathonian macrocephalitids – M. cf. keeuwensis Boehm (M and m), M. keeuwensis var. aff. forma flexuosa Boehm (m) and M. cf. mantataranus Boehm (M). In light of improved high–resolution stratigraphy, the Kachchh Bathonian fauna is evaluated and an improved biostratigraphy of the basin is proposed.
Item Type: | Journal article |
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Keywords: | Macrocephalites; Bathonian; Middle Jurassic; Kachchh; South Tethys |
Faculties: | Geosciences > Department of Earth and Environmental Sciences > Paleontology and Geobiology > Zitteliana > Zitteliana from volume 88 > Zitteliana 94 |
Subjects: | 500 Science > 560 Fossils and prehistoric life |
URN: | urn:nbn:de:bvb:19-epub-75978-8 |
ISSN: | 0373-9627 |
Language: | English |
Item ID: | 75978 |
Date Deposited: | 19. May 2021, 11:51 |
Last Modified: | 19. May 2021, 11:52 |