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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Rare tool marks from the Upper Ordovician of Estonia (Baltica)
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Rare tool marks from the Upper Ordovician of Estonia (Baltica)

机译:爱沙尼亚上奥陶纪(巴尔提卡)的稀有工具标记

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摘要

Tool marks from the Upper Ordovician of eastern Baltica are here described for the first time. These tool marks are composed of relatively large sets of thin regular parallel ridges. They are similar to the 'Eophyton' tool marks from the Cambrian of Sweden. They also resemble tabulate groove marks from the Upper Ordovician of the Cincinnati, Ohio, region of North America. Most likely these tool marks were produced by linear sweeping across the sediment of tabulate corals or crinoid stems. The rarity of tool marks in the carbonate rocks of the Ordovician of eastern Baltica indicates rarity of sedimentation environments favourable for their formation.
机译:这里是第一次描述来自波罗的海东部奥陶纪的工具标记。这些工具标记由相对较大的一组规则的平行细脊组成。它们类似于瑞典寒武纪中的“ Eophyton”工具标记。它们还类似于北美地区俄亥俄州辛辛那提市的上奥陶纪的制表槽纹。这些工具标记很可能是通过线性扫查表格珊瑚或海百合茎的沉积物而产生的。波罗的海东部奥陶纪碳酸盐岩中工具标记的稀有性,表明有利于它们形成的沉积环境的稀有性。

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