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<p>We report Late Jurassic ammonite <i>Aulacosphinctes</i> sp. from the volcano-sedimentary sequences of the Dras Formation in the Ladakh Himalaya, India, for the first time. The Cretaceous Dras Formation, characterized by its thick layers of volcano-sedimentary deposits, preserves mainly foraminifera and radiolarians. In this paper, we try to bring about a perception change regarding the age of the Dras Formation. The discovery of <i>Aulacosphinctes</i> sp. from the Dras Formation—undoubtedly speaks for the Tithonian age. The interspersed nature of the volcano-sedimentary sequences of Dras Formation with the basalt of Dras volcanics further indicates episodic volcanism along the southern margin of Neotethyan ocean between India and Eurasia. This discovery prompts a reassessment of the palaeogeographic position and evolution of the Dras arc during the Late Jurassic.</p>

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Evolution of Dras arc in the backdrop of the India-Eurasia collision: evidence from the discovery of ammonite from Indus Suture Zone, Ladakh Himalaya, India

  • 期刊论文

  • 发表日期：

    2025年4月13日

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  • Prasenjit Barman,
  • Shruti R. Mishra,
  • Narendra K. Swami,
  • Arindam Roy,
  • Alok C. Pande

摘要

We report Late Jurassic ammonite Aulacosphinctes sp. from the volcano-sedimentary sequences of the Dras Formation in the Ladakh Himalaya, India, for the first time. The Cretaceous Dras Formation, characterized by its thick layers of volcano-sedimentary deposits, preserves mainly foraminifera and radiolarians. In this paper, we try to bring about a perception change regarding the age of the Dras Formation. The discovery of Aulacosphinctes sp. from the Dras Formation—undoubtedly speaks for the Tithonian age. The interspersed nature of the volcano-sedimentary sequences of Dras Formation with the basalt of Dras volcanics further indicates episodic volcanism along the southern margin of Neotethyan ocean between India and Eurasia. This discovery prompts a reassessment of the palaeogeographic position and evolution of the Dras arc during the Late Jurassic.