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<p><i>Blaschkeiceras</i> Zeiss, a rare Tithonian (Upper Jurassic) ammonite genus is now recorded for the first time from the Jaisalmer Basin of western India. <i>Blaschkeiceras schoepflini</i> (Blaschke) (M) is documented from the Bhadasar Formation (Jaisalmer Basin) associated with <i>Virgatosphinctes denseplicatus</i> (Waagen) (M) and <i>Virgatosphinctes communis</i> Spath (M). Jaisalmer occurrence dates from the local Oppeli Subzone, Denseplicatus Zone and is correlated with the Standard Tethyan late Tithonian Microcanthum Zone. A brief interval of rising sea level during the Microcanthum Zone probably resulted in the rapid dispersal/migration/exchange of several pandemic taxa such as <i>Corongoceras</i>, <i>Micracanthoceras</i>, <i>Durangites</i>, <i>Himalayites</i> and <i>Blaschkeiceras</i> into western India, aided by temperature-control due to the palaeolatitudinal position of localities (i.e., subtropical regions on either side of the equator; ~ 35° north and south).</p>

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On the occurrence of the ammonite genus Blaschkeiceras Zeiss, 2001, from the Upper Jurassic (Tithonian) of the Jaisalmer Basin, western India

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  • 发表日期：

    2025年7月31日

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  • Sreepat Jain,
  • Günter Schweigert

摘要

Blaschkeiceras Zeiss, a rare Tithonian (Upper Jurassic) ammonite genus is now recorded for the first time from the Jaisalmer Basin of western India. Blaschkeiceras schoepflini (Blaschke) (M) is documented from the Bhadasar Formation (Jaisalmer Basin) associated with Virgatosphinctes denseplicatus (Waagen) (M) and Virgatosphinctes communis Spath (M). Jaisalmer occurrence dates from the local Oppeli Subzone, Denseplicatus Zone and is correlated with the Standard Tethyan late Tithonian Microcanthum Zone. A brief interval of rising sea level during the Microcanthum Zone probably resulted in the rapid dispersal/migration/exchange of several pandemic taxa such as Corongoceras, Micracanthoceras, Durangites, Himalayites and Blaschkeiceras into western India, aided by temperature-control due to the palaeolatitudinal position of localities (i.e., subtropical regions on either side of the equator; ~ 35° north and south).