Abstract

Ammonoid collections assembled in recent years from the Upper Asselian-Lower Sakmarian limestones of the Sterlitamak Shakh-Tau shikhan enabled a detailed study of this small but very interesting assemblage. Currently, only seven ammonoid genera are known from this locality, including Properrinites sp. from the family Perrinitidae, which is the first record of this family from the Urals. Finds of several well-preserved specimens of Medlicottia subdorbignyi Gerassimov confirmed the occurrence of the earliest known Medlicottia at the top of the Asselian, and not in the upper Sakmarian, as was previously thought. The study of the Asselian-Sakmarian ammonoids of Shakh-Tau allowed the species composition of the genera Medlicottia and Somoholites to be revised.

中文翻译：

---

早二叠世沙赫-陶礁（巴什科尔托斯坦共和国）的阿瑟勒-萨克曼氨虫

摘要

近年来，从Sterlitamak Shakh-Tau shikhan的上Asselian-Lower Sakmarian石灰岩中组装的氨水类收藏品使对这种小型但非常有趣的组合的详细研究成为可能。目前，从该地区仅知道七个氨属属，包括Properrinites sp。来自Perrinitidae家族，这是乌拉尔家族的第一个记录。发现几个保存完好的Medlicottia subdorbignyi Gerassimov标本后，证实了最早的已知Medlicottia发生在Asselian的顶部，而不是先前认为的在Sakmarian的上部。Shakh-Tau的Asselian -Sakmarian氨类动物的研究使Medlicottia和烟煤要修订。