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Abstract <p>The Jurassic‒Cretaceous boundary interval of the European part of Russia (the boundary between the Volgian and Ryazanian stages) is associated with regionally developed gaps involving 1–2 ammonite zones and related horizons of redeposition and condensation. By studying palynomorphs separately from the body chambers of ammonites and from host deposits in two reference sections (Kuzminskoye, Ryazan Oblast; Maryevka, Ulyanovsk Oblast), the different ages of ammonites and host rocks have been proven, despite the good preservation of ammonites and lack of visible signs of redeposition. This made possible to establish the re-deposition of Volgian ammonites of the genus <i>Garniericeras</i> in the Ryazanian Stage of the Ryazan region, as well as to demonstrate the age discrepancy between the ammonites and host sediments at the Volgian–Ryazanian stage boundary in the Maryevka section.</p>

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Palynomorphs–Indicators of the Redeposition of Ammonites in the Jurassic–Cretaceous Boundary Interval of the European Part of Russia

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • A. V. Lidskaya,
  • M. A. Rogov

摘要

Abstract

The Jurassic‒Cretaceous boundary interval of the European part of Russia (the boundary between the Volgian and Ryazanian stages) is associated with regionally developed gaps involving 1–2 ammonite zones and related horizons of redeposition and condensation. By studying palynomorphs separately from the body chambers of ammonites and from host deposits in two reference sections (Kuzminskoye, Ryazan Oblast; Maryevka, Ulyanovsk Oblast), the different ages of ammonites and host rocks have been proven, despite the good preservation of ammonites and lack of visible signs of redeposition. This made possible to establish the re-deposition of Volgian ammonites of the genus Garniericeras in the Ryazanian Stage of the Ryazan region, as well as to demonstrate the age discrepancy between the ammonites and host sediments at the Volgian–Ryazanian stage boundary in the Maryevka section.