A rare ammonite assemblage in the Romaniceras ornatissimum Zone (Middle Turonian) from the Uchaux Massif, Vaucluse, France

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-07-01 DOI:10.2110/carnets.2022.2209

F. Amédro, C. Baudouin, G. Delanoy, Christian Devalque, F. Robaszynski

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Abstract

The Uchaux Massif (Vaucluse, SE France) is one of the rare places in Europe where ammonites collecting can be led from a high middle Turonian through Late Turonian. That incited Alcide d'Orbigny in 1852 to quote Uchaux as "the French type of the Turonian stage" to complement the Saumur, Tourtenay, Montrichard and Tours localities mentionned in 1842 when the stage was created. In 2014, the monograph by Robaszynski et al. synthetized and actualized the informations available on the litho- and biostratigraphy of the Turonian from the Uchaux Massif. More recently, a new outcrop at Mondragon, in a place named Prés Morel, exposes the whole carbonate siltstones with Spongia of the Peyras Member (UL3). Were collected : Lewesiceras peramplum (Mantell, 1822), Romaniceras (Romaniceras) marigniacum Amédro & Châtelier, 2020, R. (Yubariceras) ornatissimum (Stoliczka, 1864), R. (Y.) kanei Jones, 1938, Collignoniceras woollgari regulare (Haas, 1946), C. carolinum (Orbigny, 1841), C. papale (Orbigny, 1841), C. turoniense (Orbigny, 1841) and a new species of Collignoniceras : C. rhodanicum Amédro, Baudouin & Delanoy sp. nov. This assemblage, unprecedented in the studied area, is characteristic of the Romaniceras ornatissimum Zone which is the third of the four ammonite zones of the middle Turonian (Tm 3). At the top of this third zone, the surprise was to find the Romaniceras marigniacum bio-horizon defined in 2020 in the southern part of the Paris Basin at the top of the Tuffeau de Bourré and at the base of the Tuffeau Jaune de Touraine. Moreover, we now think that the Peyras Member has to be fully assigned to the Romaniceras ornatissimum Zone. Lastly, the assemblage includes a rich population of Collignoniceras carolinum (24 specimens), the most important known to-day over the world. All these ammonites allow to know the spectrum of their morphological variations and show a dimorphism through the existence of micro- and macroconchs.

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法国Vaucluse Uchaux地块Romaniceras ornatissimum带(中Turonian)中罕见的菊石组合

Uchaux Massif (Vaucluse，法国东南部)是欧洲罕见的收集菊石的地方之一，可以从高中Turonian到晚Turonian。这促使Alcide d'Orbigny在1852年引用乌肖为“法国式的图尔尼亚舞台”，以补充1842年舞台创建时提到的索穆尔、图尔特内、蒙特里沙尔和图尔地区。2014年，Robaszynski等人的专著综合并实现了乌肖地块Turonian期岩性和生物地层学的现有信息。最近，在蒙德拉贡一个名为pracimas Morel的地方，出现了一个新的露头，露出了整个带有Peyras成员海绵岩(UL3)的碳酸盐粉砂岩。收集到:leesiceras peramplum (Mantell, 1822)， Romaniceras (Romaniceras) marigniacum am & chaltelier, 2020, R. (Yubariceras) ornatissimum (Stoliczka, 1864)， R. (Y.) kanei Jones, 1938, Collignoniceras woollgari regulare (Haas, 1946)， C. carolinum (Orbigny, 1841)， C. papale (Orbigny, 1841)， C. turoniense (Orbigny, 1841)和Collignoniceras一新种:c . rhodanicum Amedro,博杜安& Delanoy sp. 11月这个组合,前所未有的研究区,特点是Romaniceras ornatissimum区第三的中间的四个亚扪人区土仑阶(Tm 3)。在这第三区,令人吃惊的是找到Romaniceras marigniacum bio-horizon定义在2020年巴黎盆地南部的顶部Tuffeau de Bourre和底部的Tuffeau黄色都兰。此外，我们现在认为，必须将佩拉斯成员完全分配给罗马装饰区。最后，该组合包括丰富的Collignoniceras carolinum(24个标本)，这是当今世界上已知的最重要的物种。所有这些菊石都可以通过微观和宏观螺的存在来了解其形态变化的光谱，并显示出二态性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.