Microfauna, Palynomorphs, and Biostratigraphy of the Upper Bajocian Strenoceras niortense Zone (Middle Jurassic) of the Kuban River Basin, Northern Caucasus

IF 1 4区 地球科学 Q3 GEOLOGY Stratigraphy and Geological Correlation Pub Date : 2024-03-20 DOI:10.1134/s0869593824020060
V. V. Mitta, L. A. Glinskikh, Yu. N. Savelieva, O. V. Shurekova
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Abstract

Microfossils of the Strenoceras niortense Zone of the Upper Bajocian of the Karachay-Cherkessian Republic are studied. The zone is represented mainly by dark gray silty-sandy clays, with scattered nodules often arranged in interbeds, and belongs to the lower part of the upper subformation of the Djangura Formation. The taxonomic composition and distribution of foraminifera, ostracods, dinoflagellate cysts, and miospores in the section has been identified. The ranges of biostratigraphic units based on foraminifera, ostracods, and dinocysts are emended and these units are correlated with the ammonite scale. The distribution of benthic foraminifers indicates that these are Beds with Ophthalmidium caucasicum, comparable with the entire Niortense Zone and most of the Garantiana Zone. The Beds with Globuligerina dagestanica established using planktonic foraminifera are correlated with the entire studied interval from the Niortense Zone to the Lower Bathonian, inclusive. In the middle-upper part of the Niortense Zone (Rostovtsevi and Baculatum Subzones), the Beds with ostracods Palaeocytheridea (Malzevia) subtilis were recognized for the first time. The beds with dinocysts Carpathodinium predae, Rhynchodiniopsis? regalis, Meiourogonyaulax valensii are correlated with the range of the Niortense and Garantiana Zones and the lower part of the Parkinsoni Zone, inclusive. Characteristic taxa of microfauna and dinocysts are illustrated.

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北高加索库班河盆地上巴约克统 Strenoceras niortense 区(中侏罗世)的微型动物群、浮游动物和生物地层学
摘要 研究了卡拉恰伊-切尔克斯共和国上巴约奇期 Strenoceras niortense 区的微化石。该区主要由深灰色淤泥质砂质粘土组成,结核散布在层间,属于Djangura Formation(姜古拉地层)上亚层的下部。有孔虫、浮游动物、甲藻胞囊和膜孢子在该剖面中的分类组成和分布情况已经查明。根据有孔虫、桡足类动物和甲藻囊虫修正了生物地层单元的范围,并将这些单元与氨虫尺度相关联。底栖有孔虫的分布情况表明,这些是高加索眼虫床,可与整个尼奥尔坦斯带和加兰蒂纳带的大部分相媲美。利用浮游有孔虫确定的有 Globuligerina dagestanica 层与从 Niortense 区到下巴松纪(包括下巴松纪)的整个研究区间相关。在 Niortense 区的中上部(Rostovtsevi 和 Baculatum 亚区),首次发现了具有浮游动物 Palaeocytheridea (Malzevia) subtilis 的床层。含有双壳贝类 Carpathodinium predae、Rhynchodiniopsis? regalis、Meiourogonyaulax valensii 的床层与 Niortense 和 Garantiana 区以及 Parkinsoni 区下部(包括该区)的范围相关。图中展示了微型动物和恐龙囊的特征类群。
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来源期刊
CiteScore
1.80
自引率
30.00%
发文量
22
审稿时长
>12 weeks
期刊介绍: Stratigraphy and Geological Correlation is the only journal that provides comprehensive coverage of the fundamental and applied aspects of stratigraphy and the correlation of geologic events and processes in time and space. Articles are based on the results of multidisciplinary studies and are for researchers, university professors, students, and geologists interested in stratigraphy and the chronological features of the world’s geological record.
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