Abstract
Two specimens of the Middle Jurassic ammonite genusReineckeia (sensu lato) have been found in the lowest beds of the Pachchham (Patcham) Limestones exposed in the core of the Jumara Dome, Kachchh (Kutch), Gujarat, western India. The stratigraphy is described in detail and the age bracketed to lie between latest Late Bathonian and Middle Bathonian, older than any previously described examples of this genus, either in India or in Europe (middle Early Callovian). The new finds are compared with other known pre-Callovian Reineckeiidae, notably those of the eastern borders of the Pacific, but the relationships are not close. The phylogenetic consequences are briefly discussed. The roots of the Reineckeiidae continue to lie hidden.
Kurzfassung
Zwei Exemplare der mitteljurassischen AmmonitengattungReineckeia (sensu lato) wurden aus den untersten Schichten der Pachchham (Patcham) Limestones geborgen, die im Kern des Jumara Dome von Kachchh (Kutch), Gujarat, westliches Indien, aufgeschlossen sind. Die Stratigraphie dieser Schichten wird im Detail beschrieben. Das Alter der beiden Exemplare kann auf den Zeitraum zwischen dem spätesten Ober-Bathon und dem Mittel-Bathon eingegrenzt werden. Damit sind sie älter als alle anderen bekannten Funde der Gattung, ob aus Indien oder Europa (mittleres Unter-Bathon). Die neuen Funde werden mit anderen Reineckeiiden aus dem Prä-Callov verglichen, vor allem mit Formen vom Ostrand des Pazifiks, die jedoch keine engen Beziehungen aufweisen. Die Schlußfolgerungen für die Phylogenie der Gruppe werden kurz diskutiert. Die Wurzeln der Reineckeiidae liegen nach wie vor im Dunkeln.
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Jain, S., Callomon, J.H. & Pandey, D.K. On the earliest known occurrence of the Middle Jurassic ammonite genusReineckeia in the Upper Bathonian of Jumara, Kachchh, western India. Paläont. Z. 70, 129–143 (1996). https://doi.org/10.1007/BF02988272
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DOI: https://doi.org/10.1007/BF02988272