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首页> 外文期刊>Annales de Paleontologie >Fossiliferous flints (marine invertebrates and terrestrial plants) from the Upper Cretaceous of Claix (Charente)
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Fossiliferous flints (marine invertebrates and terrestrial plants) from the Upper Cretaceous of Claix (Charente)

机译：来自克莱伊克斯（夏朗德）上白垩统的化石fl石（海洋无脊椎动物和陆生植物）

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Fossiliferous flint accumulations have been discovered in surface deposits at Claix, in Charente (SW France). These silicifications come both from alterites or limestones with flints, and from Palaeolithic or Neolithic habitats. A first part of the flints, beige or brown, is rich in bryozoans, pectinids and oysters Ceratostreon pliciferum Dujardin. Strongly alterated (oxydized, whitened) and scattered on large agricultural surfaces (fields, vines), they constitute relict nodules probably resulting from the secondary silicification of local shelly limestones of the Late Coniacian series during Palaeogene climatic weathering. Other silicified blocks (sandstones and flints) are devoid of oysters but very rich in plant fossils (angiosperms, conifers, and ferns). They have been observed both in sub-primary position, extracted from their alterites or limestones by plowings, and in archaeological context within Palaeolithic or Neolithic habitats. Their dating is difficult because a variable diachronism can exist between these different flints with plants, more or less anthropized. The presence of spatangoid echinoids, such as "Periaster" conicus d'Orbigny or "P." oblongus d'Orbigny in the flints bearing plants argues for a Late Turonian dating. However, the geological synthesis of the regional Cretaceous series reveals occurrences of lignitic clay or marls both in the uppermost Turonian of Dordogne and in the lowermost Coniacian of Charente. Thus, the flints with plants of Claix could come not only from in situ or relict primary silicifications of uppermost Turonian deposits but from secondary silicifications of lowermost Coniacian deposits too (Palaeogene neoformation). The flora of the Claix flints is compared to the ones of Cretaceous flints from ArchingeayLes Nouillers (Charente-Maritime) and Torsac (Charente) and from the Late Cretaceous lignitic clay of Charente, Charente-Maritime and Dordogne. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：在夏朗德省（法国西南部）的克莱克斯（Claix）的表层沉积物中发现了化石火石堆积物。这些硅化作用既来自变质岩或带有fl石的石灰石，也来自旧石器时代或新石器时代的栖息地。 int石的第一部分，米色或棕色，富含苔藓虫，果胶和牡蛎角杜鹃（Ceratostreon pliciferum Dujardin）。它们经过强力改造（氧化，增白）并散布在较大的农业表面（田地，葡萄树）上，构成了遗迹结核，可能是由于古生代气候风化期间晚柯尼西亚系列局部贝壳状灰岩的二次硅化作用所致。其他硅化块（砂岩和fl石）没有牡蛎，但富含植物化石（被子植物，针叶树和蕨类植物）。在次原始位置，通过耕作从它们的alter石或石灰石中提取它们，以及在考古环境中在旧石器时代或新石器时代的栖息地中都观察到它们。他们的约会很困难，因为这些不同的火石与植物之间或多或少被人工化了，可能存在不同的历时性。存在类spatangoid棘突类动物，例如“ Periaster” conicus d'Orbigny或“ P”。带有植物的火石上的长圆形d'Orbigny主张晚Turonian约会。然而，该地区白垩纪系列的地质综合显示，在多尔多涅省的最高Turonian和Charente的最低Coniacian中都出现了木质粘土或泥灰岩。因此，带有Claix的植物的火石不仅可能来自最上层的Turonian矿床的原位或遗留初级硅化作用，而且也可能来自最底层的Coniacian矿床的次生硅化作用（古近纪新形成）。将Claix火石的菌群与ArchingeayLes Nouillers（滨海夏朗德）和Torsac（夏朗德）的白垩纪火石以及Charente，Charente-Maritime和Dordogne的晚白垩纪白云质黏土进行了比较。 （C）2016 Elsevier Masson SAS。版权所有。

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