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On the dimorphic occurrence of the upper Tithonian ammonite genus Djurjuriceras Roman from the Blue Nile Basin (Ethiopia)

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Abstract

The dimorphic pair of the ammonite genus Djurjuriceras Roman, 1936 is documented from Ethiopia with its first ever microconch and the corresponding macroconch from the upper part of the Antalo Limestone Formation exposed at Dejen, Blue Nile Basin (Central Western Ethiopia). Djurjuriceras is associated with Oxylenticeras Spath, 1950. Based on ammonite, calpionellid and calcareous nannofossil evidences, the two taxa are assigned to an upper Tithonian (Microcanthum Zone) age. These finds, both regionally and globally, have fundamental bearing for biostratigraphic resolution and biozonal correlations.

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Acknowledgements

The authors are grateful to two anonymous reviewers, Associate Editor Dr. Christian Klug (Zurich, Switzerland) and the Editor-in-Chief Dr. Mike Reich (Braunschweig, Germany) for their constructive comments and helpful suggestions. SJ gratefully acknowledges literature help from Drs. Luc Bulot (France), Mikhail Rogov (Russia), Verónica Vennari (Argentina) and Camille Frau (France).

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  1. Department of Geology, Adama Science and Technology University, Adama, Oromia, Ethiopia

    Sreepat Jain

  2. State Museum of Natural History Stuttgart, Rosenstein 1, 70191, Stuttgart, Germany

    Guenter Schweigert

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  1. Sreepat Jain
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  2. Guenter Schweigert
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Correspondence to Sreepat Jain.

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Handling Editor: Christian Klug.

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Jain, S., Schweigert, G. On the dimorphic occurrence of the upper Tithonian ammonite genus Djurjuriceras Roman from the Blue Nile Basin (Ethiopia). PalZ 96, 655–668 (2022). https://doi.org/10.1007/s12542-022-00620-y

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