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首页> 外文期刊>Journal of Systematic Palaeontology >The Middle Llandovery brachiopod fauna of the newlands formation, Girvan, Scotland
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The Middle Llandovery brachiopod fauna of the newlands formation, Girvan, Scotland

机译：新大陆形成的中间Llandovery腕足动物区系，苏格兰Girvan

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摘要

Forty-one Lower Silurian brachiopods from a single locality in the Newlands Formation of Girvan, Strathclyde, Scotland, are described and illustrated, many for the first time. The age of the fauna is well constrained by overlying magnus Biozone graptolites and underlying cyphus Biozone graptolites, indicating the early Middle Llandovery (Lower Aeronian) and it is the only shelly fauna known of Lower Aeronian age from anywhere in Scotland. A new endemic genus Chronostrophonella (Family Strophonellidae) is described: another new genus, Eopentamerus (Family Pentameridae) is known additionally from Wales. New species are Craniops laurentia, Biparetis Caledonia, Eo-stropheodonta augusta, Chronostrophonella terranova, Strophochonetes newlandensis, Triplesia girvanensis, Resserella praeclara, Camerellal elainae, Eopentamerus inexpectatus and Protatrypa copperi. The Strophochonetes is the earliest-known chonetoid from the Silurian anywhere, although the family originated in the Late Ordovician. Whilst Newlands was on the margin of Laurentia just prior to its Caledonian Orogeny collision in mid-Silurian times with Avalonia-Baltica, the brachiopod fauna there was already similar in the Lower Aeronian, at least at the generic level, to those from the opposite side of the lapetus Ocean in Wales and the Welsh Borderland (Avalonia) and Norway and other parts of Baltica. The proximity of these and other terranes to each other was the key reason for the relative cosmopolitanism of all lower-latitude Lower Silurian brachiopod faunas.
机译：描述和说明了来自苏格兰斯特拉斯克莱德Girvan的Newlands组中一个地点的41个下志留纪腕足动物，这是第一次。动物区系的年龄受到上盖的马格努斯生物区岩藻岩和下伏的巨蟹座生物区岩藻岩的限制，这表明了早期的中兰德韦里（下奥罗尼安），并且它是苏格兰任何地方唯一已知的下奥罗尼安时代的有壳动物。描述了一种新的地方性克氏菌属（Strophonellidae家族）：另外一个新的属，Eopentamerus（Pentameridae家族）也从威尔士得知。新的物种有克劳尼奥斯劳伦蒂亚，比帕雷蒂斯喀里多尼亚，Eo-stropheodonta augusta，terranostrophonella terranova，新大陆的Strophochonetes，Triplesia girvanensis，Resserella praeclara，Camerellal elainae，Eopentamerus inexpectatus和Protatrypa Copperi。尽管家族起源于奥陶纪晚期，但Strophochonetes是来自志留纪的最早的类软骨。纽兰在西里尔时期中古苏格兰造山运动与Avalonia-Baltica碰撞之前就位于Laurentia边缘，但腕足动物在较低的Aeronian中已经与对侧的相似。威尔士和威尔士边境地区（阿瓦隆），挪威和波罗的海其他地区的羽状海洋。这些和其他地形彼此接近是所有低纬度志留纪腕足动物群相对世界化的主要原因。

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