Abstract

Brachiopod shell imprints from the core samples from Borehole XC-1 (1012–1013 m), Shumnaya Formation, Botomian–Toyonian stages, Lower Cambrian, Siberian Platform were examined. The samples are represented by thin laminated bituminous mudstone. Imprints of phosphate brachiopod (lingulids and acrotretids) valves and casts of valves occur on the bedding surfaces of the samples. One sample contains a cluster of small fossils (60–220 µm) probably belonging to embryos or brephic valves of these brachiopods. Chemical analysis has revealed that the originally organic material of the valves was replaced by pyrite, most likely postmortem. At the same time, the fragments of the valves of adult lingulate brachiopods are composed of calcium phosphate.

中文翻译：

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西伯利亚西北部地台（XC-1 钻孔）Shumnine 组（Bottomian 和 Toyonian 阶段，下寒武统）泥岩中有机磷腕足动物幼年瓣膜的埋藏学

摘要

对来自 Borehole XC-1 (1012–1013 m)、Shumnaya 组、Bottomian-Toyonian 阶段、下寒武统、西伯利亚地台的岩芯样本中的腕足动物壳印记进行了检查。样品以薄层状沥青泥岩为代表。磷酸盐腕足动物（舌形动物和肢端动物）瓣膜和瓣膜铸件的印记出现在样品的垫层表面上。一个样本包含一簇小化石（60-220 µm），可能属于这些腕足动物的胚胎或双瓣。化学分析表明，阀门最初的有机材料很可能是在死后被黄铁矿取代的。同时，成年舌状腕足动物的瓣膜碎片是由磷酸钙组成的。