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<p>The lower Toarcian ammonites of the upper Uanei Formation from SW Somalia are revised following their taphonomic analysis. Two fossiliferous layers are distinguished: a lower one, characterized by assemblage of hildoceratid taxa of the subfamilies Hildoceratinae and Bouleiceratinae, is dated to the transition Tenuicostatum to Serpentinum zones; the upper layer is aged to the transition from the Serpentinum to Bifrons zones, based on the mixing of <i>Parahildaites</i> pl. sp. and Harpoceratinae without Bouleiceratinae. Taxonomic details of the genus <i>Bouleiceras</i> are discussed and represented by six species, two of which are new: <i>B. lanceolatum</i> n. sp. and <i>B. goyi</i> n. sp. The potential of further research in the eastern margin of the African plate is discussed with the perspective of reinforcing its role as a centre of dispersion for the Bouleiceratinae towards the western Tethys and the Andean basins in the Serpentinum Zone.</p>

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Lower Toarcian ammonites from South-western Somalia: the Bouleiceras record of the upper Uanei Formation in the Iscia Baidoa country (SW Somalia)

  • 期刊论文

  • 发表日期：

    2025年6月15日

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  • Giulio Pavia

摘要

The lower Toarcian ammonites of the upper Uanei Formation from SW Somalia are revised following their taphonomic analysis. Two fossiliferous layers are distinguished: a lower one, characterized by assemblage of hildoceratid taxa of the subfamilies Hildoceratinae and Bouleiceratinae, is dated to the transition Tenuicostatum to Serpentinum zones; the upper layer is aged to the transition from the Serpentinum to Bifrons zones, based on the mixing of Parahildaites pl. sp. and Harpoceratinae without Bouleiceratinae. Taxonomic details of the genus Bouleiceras are discussed and represented by six species, two of which are new: B. lanceolatum n. sp. and B. goyi n. sp. The potential of further research in the eastern margin of the African plate is discussed with the perspective of reinforcing its role as a centre of dispersion for the Bouleiceratinae towards the western Tethys and the Andean basins in the Serpentinum Zone.