Abstract

Ammonites from two separate limestone blocks in the Bodrak River basin (Southwest Crimea) are described. The assemblage from the first boulder (on Tatyana’s Hill) is represented by the Echioceratidae ammonites (genera Orthechioceras and Echioceras). The ammonite complex from the second boulder (in the Ammonite Ravine) is represented by one species of Calliphylloceras (family Phylloceratidae), one species of Uptonia (family Polymorphitidae), and three species of the genus Tropidoceras (family Tropidoceratidae). A new species Tropidoceras komarovi is described. For the first time for the Lower Jurassic of Crimea, a sequence of biostratigraphic units is proposed within each of the studied boulders. These units are correlated with biostratigraphic units (zones, subzones, and biohorizons) of the Sub-Mediterranean scale. Within the first boulder, the following units (bottom to top) are established: (1) Biohorizon Orthechioceras edmundi; (2) Biohorizon Echioceras rhodanicum; (3) Biohorizon Echioceras raricostatoides and (4) Biohorizon Echioceras crassicostatum, which correspond to the Raricostatum Zone and Densinodulum and Raricostatum subzones of the upper Sinemurian of Europe. Within the second block, the following units are established (from bottom to top): (1) Biohorizon Uptonia cf. jamesoni and (2) Biohorizon Tropidoceras erythraeum, corresponding to Jamesoni Zone (Jamesoni Subzone) and the bottom of the Ibex Zone (Masseanum Subzone) of the lower Pliensbachian of Europe. It is shown that the studied blocks in Bodrak River basin are composed of limestones of different ages, which, in turn, are different from the age of enclosing rocks.

中文翻译：

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来自克里米亚西南部博德拉克河流域石灰岩巨石的早侏罗世（晚 Sinemurian-早 Pliensbachian）菊石

摘要

描述了来自博德拉克河流域（克里米亚西南部）两个独立石灰岩块的菊石。来自第一块巨石（在 Tatyana's Hill）的组合由 Echioceratidae 菊石（Orthechioceras和Echioceras属）代表。来自第二块巨石（位于菊石峡谷）的菊石复合体由一种Calliphylloceras（Phylloceratidae科）、一种Uptonia（Polymorphitidae 科）和三种Tropidoceras属（Tropidoceratidae 科）代表。科马罗维热带亚纲新种被描述。对于克里米亚的下侏罗纪，首次在每个研究的巨石中提出了一系列生物地层单元。这些单位与亚地中海尺度的生物地层单位（带、亚带和生物地层）相关。在第一块巨石中，建立了以下单元（从下到上）： (1) Biohorizo​​n Orthechioceras edmundi；(2) Biohorizo​​n Echioceras rhodanicum；(3) Biohorizo​​n Echioceras raricostatoides 和 (4) Biohorizo​​n Echioceras crassicostatum，对应于欧洲上 Sinemurian 的 Raricostatum 区和 Densinodulum 和 Raricostatum 亚区。在第二个区块内，建立了以下单元（从下到上）： (1) Biohorizo​​n Uptonia cf. jamesoni 和 (2) Biohorizo​​n Tropidoceras erythraeum，对应于欧洲下普林斯巴赫阶的詹姆逊带（Jamesoni Subzone）和野山羊带（Masseanum Subzone）的底部。结果表明，博德拉克河流域的研究区块由不同时代的石灰岩组成，而石灰岩与围岩时代不同。