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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >A rare occurrence of Late Hettangian ammonites (Angulaticeras and Paracaloceras) in the Mediterranean Tethys (Rif, Northern Morocco)
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A rare occurrence of Late Hettangian ammonites (Angulaticeras and Paracaloceras) in the Mediterranean Tethys (Rif, Northern Morocco)

机译：在地中海的特提斯（北摩洛哥里夫）极少见有晚海棠属铵盐（安格拉古拉斯和巴拉卡罗埃拉斯）

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摘要

This paper describes and illustrates three newly discovered Late Hettangian ammonite specimens from the "Dorsale calcaire" (Calcareous Range) of the internal units of the Rif (Northern Morocco). Two additional Early Sinemurian ammonite specimens are also studied and all the Early and middle Lower Jurassic ammonites collected earlier in this area and illustrated in the literature are included in order to clarify the biostratigraphical and palaeobiogeographical framework. The Late Hettangian Moroccan assemblage which includes Angulaticeras marmoreum (OPPEL, 1862) and Paracaloceras haueri (GUMBEL, 1861) is close to the coeval faunas which have been known since the 19th century in several famous fossiliferous localities of the Northern Calcareous Alps (NCA). These faunal similarities support the palaeobiogeographical hypothesis which supposes the existence, during the Jurassic, of a "Mesomediterranean terrane" or "ALKAPECA micro-continent" which is currently dislocated. The Betic, Rif, Kabylia and Peloritani "Dorsales" are fragments of this former micro-continent. This hypothesis suggests that the "Dorsale calcaire" of the Rif and the NCA were closer together during the Jurassic.
机译：本文描述并举例说明了三个新发现的来自里夫（北摩洛哥）内部单位的“ Dorsale calcaire”（Calcareous Range）的晚Hettangian mon石标本。还研究了另外两个Sinemurian早期铵盐标本，并包括了该地区较早收集的所有早侏罗纪和中侏罗纪铵盐，并在文献中进行了说明，以阐明生物地层学和古生物地理学框架。 Hettangian晚期的摩洛哥组合包括Angulaticeras marmoreum（OPPEL，1862年）和Paracaloceras haueri（GUMBEL，1861年），与19世纪以来在北钙质阿尔卑斯山（NCA）的几个著名化石场所中已知的中世纪动物群很接近。这些动物上的相似性支持了古生物地理学假说，该假说假设在侏罗纪时期存在“ Mesomediterranean terrane”或“ ALKAPECA micro-continent”目前已错位。 Betic，Rif，Kabylia和Peloritani“ Dorsales”是这个前微型大陆的片段。这一假设表明，在侏罗纪时期，里夫和南卡罗来纳州的“后方卡萨尔”更为紧密。

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