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首页> 外文期刊>Lethaia: An International Journal of Palaeontology and Stratigraphy >ArthrophycusArthrophycus as a mimic of crinoid column impressions in the lower Silurian of central Kentucky, USAUSA
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ArthrophycusArthrophycus as a mimic of crinoid column impressions in the lower Silurian of central Kentucky, USAUSA

机译： arthrophycus arthrophycus 作为中央肯塔基州下硅兰建模的红细胞柱印象是模拟的， 美国美国

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> Unusual specimens of an ichnofossil, herein ascribed to Arthrophycus , are described from siltstone tempestites in the lower Silurian (Llandovery, Telychian) Estill Shale near Irvine, Estill County, central Kentucky, USA. The specimens display closely spaced, uncurved transverse annulations, but lack the medial ridge, rectangular cross‐sectional shape and dense branching typical of common Silurian Arthrophycus ichnospecies. This combination of features, coupled with the straightness of burrows and alignment parallel to inorganic tool marks, closely approximates the appearance of moulds of partially articulated crinoid columns (= pluricolumnals) that were impressed into firm mud and cast by storm‐deposited sediment. That these structures do not represent the external moulds of body fossils is suggested by minor width variations along the long axis of specimens, possible bioglyphs and the total absence of skeletal material, including isolated crinoid columnals, in this and other tempestites from this interval. More convincingly, the presence of very sparse branching indicates a trace fossil origin for these structures. These fossils are best interpreted as the products of preferential mining of inorganically generated tool marks by deposit feeders, owing to exposure of more organic‐rich muds by erosional scouring. Thus, this occurrence represents a rare instance in which trace fossils display a strong alignment parallel to inorganic sedimentary structures.
机译： > 在本文中归因于Ichnofossil的不寻常标本 雄霉菌 ，由伊尔维林，埃斯泰尔郡，美国中部埃尔斯泰尔郡附近的硅灰岩（Llandovery，Telychian）Estill页岩中的粉砂岩虫。标本显示紧密间隔，透明的横向环节，但缺乏内侧脊，矩形横截面形状和典型的常见硅里亚典型的致密分支 雄霉菌 ichnospecies。这种特征的组合，与沟槽的直线度相结合，并平行于无机工具标​​记的对准，与局部铰接式的十字花柱（= purliColumumnals）的模具的外观接近，该柱子（= purliColumumnals）被印象深刻的泥浆和沉积的沉积物铸造。这些结构不代表身体化石的外部模具，提出沿着沿着标本的长轴，可能的生物产物和骨骼材料的总体缺失，包括孤立的十字单柱，在这种间隔中的孤立的十字单柱的总体缺失。更令人信服地，存在非常稀疏的分支表示这些结构的痕量化石原点。由于通过侵蚀侵蚀暴露，这些化石是最好的沉积饲养饲养者优先采矿的优先挖掘工具标记的产品。因此，这种发生代表了一种罕见的实例，其中痕量化石显示平行于无机沉积结构的强对准。

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