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Abstract <p>The ammonoid fauna from the stratotype section of the Beleutian Regional Substage in the Beleuty River basin in the Ulytau Region of Central Kazakhstan is studied. For the first time, the locality details and precise level of the ammonoid occurrence near the base of the Beleutian Regional Substage in the stratotype section of the terrigenous-carbonate Beleuty Formation are documented. The composition of the assemblage indicates the lower Serpukhovian <i>Uralopronorites–Cravenoceras</i> Genozone, but probably not its base. Therefore, the original lower boundary of the Beleutian Regional Substage does not correlate with the base of the Serpukhovian Stage. A new species of the genus <i>Cravenoceras</i> is described.</p>

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Ammonoids from the Beleutian Regional Substage (Lower Carboniferous) of Central Kazakhstan

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • S. V. Nikolaeva

摘要

Abstract

The ammonoid fauna from the stratotype section of the Beleutian Regional Substage in the Beleuty River basin in the Ulytau Region of Central Kazakhstan is studied. For the first time, the locality details and precise level of the ammonoid occurrence near the base of the Beleutian Regional Substage in the stratotype section of the terrigenous-carbonate Beleuty Formation are documented. The composition of the assemblage indicates the lower Serpukhovian Uralopronorites–Cravenoceras Genozone, but probably not its base. Therefore, the original lower boundary of the Beleutian Regional Substage does not correlate with the base of the Serpukhovian Stage. A new species of the genus Cravenoceras is described.