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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >New taxonomic and biostratigraphic data on the ? Upper Cenomanian Turonian Radiolitidae (Bivalvia : Hippuritoidea) of Abu Roash, Western Desert, Egypt
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New taxonomic and biostratigraphic data on the ? Upper Cenomanian Turonian Radiolitidae (Bivalvia : Hippuritoidea) of Abu Roash, Western Desert, Egypt

机译:上的新的分类学和生物地层学数据?埃及西部沙漠的阿布·罗什(Abu Roash)的上西诺曼尼亚人Turonian Radiolitidae(Bivalvia:Hippuritoidea)

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摘要

The Rudistae Series of Abu Roash of Egypt contains abundant radiolitid bivalves that are described herein in detail. Mate Cenomanian - Turonian is assigned to this series. The studied sequence includes Bournonia fourtaui DOUVILLE, 1910, Durania gaensis (DACQUE, 1903), Eoradiolites cf davidsoni (HILL, 1893), Eoradiolites liratus (CONRAD, 1852), Praeradiolites ponsianus (D'ARCHIAC, 1835), Radiolites sauvagesi (D'HOMBRES-FIRMAS, 1838), Radiolites lewyi PARNES, 1987, and Radiolites lusitanicus (BAYLE, 1857). Four species are documented for the first time in the studied area. Stratigraphically, the Rudistae Series can be subdivided into three distinct stratigraphic units. They are, from oldest to youngest: Unit 1 (?Upper Cenomanian) is represented by rnarl intercalated with a thin limestone bed. The rudist species Eoradiolites cf davidsoni (HILL, 1893) and Eoradiolites liratus (CONRAD, 1852) are predominant within the upper portion of the marl bed of this unit. This bed may tentatively determine the C/T boundary in this area. Unit 2 (Turonian) consists mainly of limestone intercalated with thin beds of marls and sandy shales. These deposits frequently contain Praeradiolites ponsianus (D'ARCHIAC, 1835), Radiolites lusitanicus (BAYLE, 1857) and Durania gaensis (DACQUE, 1903). Unit 3 (Turonian) represents the youngest unit of the Rudistae Series. It starts with rudist- free sandy shale bed. The last limestone bed in this unit contains the thick-shelled radiolitid Durania gaensis (DACQUE, 1903) and numerous shells of Bournonia fourtaui DOUVILLE, 1910, Radiolites lewyi PARNES, 1987, and Radiolites sauvagesi (D'HOMBRES-FIRMAS, 1838).
机译:埃及的阿布·罗什(Abu Roash)的Rudistae系列包含丰富的放射性双壳类动物,本文对此进行了详细描述。 Mate Cenomanian-Turonian被分配给该系列。研究的序列包括Bournonia fourtaui DOUVILLE,1910,Durania gaensis(DACQUE,1903),Eoradiolites cf davidsoni(HILL,1893),Eoradiolites liratus(CONRAD,1852),Praeradiolites ponsianus(D'ARCHIAC,1835),Radiolites sauvagesi(D' HOMBRES-FIRMAS,1838年),Radiolites lewyi PARNES,1987年和Radiolites lusitanicus(BAYLE,1857年)。在研究区域内首次记录了四个物种。在地层学上,Rudistae系列可以细分为三个不同的地层单位。从最早到最小,它们是:第1单元(?Cenomanian上层)由插入薄石灰岩床的rnarl代表。在该单元泥灰岩床的上部,主要有红树林种(Eoradiolites cf davidsoni)(HILL,1893)和红桉树(laratus liratus)(CONRAD,1852)。该床可以临时确定该区域中的C / T边界。第2单元(突尼斯人)主要由石灰岩和薄薄的泥灰岩和砂质页岩层组成。这些矿床经常包含普兰松岩(D'ARCHIAC,1835年),放射性岩(italy)(BAYLE,1857年)和Durania gaensis(DACQUE,1903年)。第3单元(土耳其语)代表Rudistae系列中最年轻的单元。它始于无须转向的沙质页岩床。该单元中的最后一个石灰岩床包含厚壳的放射性核Durania gaensis(DACQUE,1903)和大量的Bournonia fourtaui DOUVILLE壳,1910年,Radiolites lewyi PARNES,1987年和Radiolites sauvagesi(D'HOMBRES-FIRMAS,1838年)。

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