Abstract—Various sedimentation settings were distinguished in the Middle, Late Jurassic (J₂k–J₃v¹) on the territory of the Kamennaya crest of the Krasnoleninsky arch in Western Siberia. It was established that clayey and glauconite-clayey sediments of the Abalak Formation were accumulated throughout most of the studied area in relatively calm shallow-sea settings. Islands formed by protrusions of the pre-Jurassic basement contributed to the formation of the Vogulka sequence as a result of the removal of clastic material from the land. The lithological studies showed that gritstones and sandstones, which composed the Vogulka sequence, were accumulated unevenly. The greatest thickness of these deposits is observed to the west of the central upland. The difference in the thickness of clastic sequence on the western and eastern slopes was probably caused by the horseshoe shape of the island and the absence of active currents on the western part of the slope, as well as by its greater steepness. The upper member of the Vogulka sequence, which is composed of detrital limestones, is extremely thin (no more than 1 m), and contains numerous unconformities. These traces of erosion may be indirect evidence of the influence of the Late Oxford regression on the section structure, which was previously noted in adjacent territories.

摘要—侏罗纪中期、晚侏罗世（J ₂ k–J ₃ v ^{1 ）有不同的沉积环境}) 位于西西伯利亚克拉斯诺列宁斯基拱门的 Kamennaya 峰顶。已经确定，Abalak 组的粘土和海绿石-粘土沉积物在相对平静的浅海环境中的大部分研究区域中积累。由前侏罗纪基底的突起形成的岛屿有助于形成 Vogulka 序列，这是由于从陆地上去除碎屑物质的结果。岩性研究表明，构成 Vogulka 层序的砂岩和砂岩堆积不均。在中部高地的西部观察到这些沉积物的最大厚度。西坡和东坡碎屑层序厚度的差异，可能是由于岛屿呈马蹄形，坡西不存在活跃水流，且坡度较大。Vogulka 层序上段由碎屑灰岩组成，极薄（不超过 1 m），含有大量不整合面。这些侵蚀痕迹可能是牛津晚期回归对剖面结构影响的间接证据，这一点之前在邻近地区已经注意到。