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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Large Camborygma isp. in fluvial deposits of the Lower Permian (Asselian) Dunkard Group, southeastern Ohio, U.S.A.
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Large Camborygma isp. in fluvial deposits of the Lower Permian (Asselian) Dunkard Group, southeastern Ohio, U.S.A.

机译：大 camborygma isp。 在俄亥俄州东南部的下二叠纪（诚信）Dunkard集团的河流沉积物中，

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AbstractThe lower Washington Formation of the Lower Permian (Asselian) Dunkard Group in southeastern Ohio contains large burrows exposed in cross section in a laterally discontinuous sandstone bed. This study examined the morphology of the burrows and their associated lithofacies to interpret the environmental conditions under which they were produced as well as the behavior and identity of the trace maker. Mudstone facies below and above the burrow-bearing sandstone consist of reddish-brown to variegated paleosols containing rhizohaloes, argillans, and large-scale slickensides, as well as thinly laminated, organic-rich shales containing plant fossils. The sandstone facies is 94–147cm thick, thinly bedded to massive, and fine- to medium-grained. The lithofacies are interpreted as deposits of crevasse splays, abandoned channels, and proximal to distal floodplains. Sixty burrows consist of vertical, subvertical, J-shaped, Y-shaped, and complex networks of branching shafts and tunnels. The burrows range from 5 to 180cm in length and 0.8–3.6cm in width. The main shaft's angles are typically ~90°, although are rarely 30–70°. Branching angles of subvertical and Y-shaped burrows vary from 0 to 90°. Many burrows extend to the top of the sandstone bed, but others turn into or out of the bed. The morphology of the burrows is most similar toCamborygma, known from continental deposits of the Permian to recent. WhileCamborygmahas been previously reported from the Permian, this is the first occurrence in the Late Paleozoic Appalachian Basin extending its geographic range. The Dunkard burrows are similar to those of modern freshwater decapo
机译：<！[cdata [ 抽象 俄亥俄州东南部的下二叠纪（诚信）德内洁集团的较低华盛顿·迪尔德集团含有大横断面暴露的大洞穴在横向不连续的砂岩床中。本研究检测了洞穴的形态及其相关的岩石遗传学，以解释其产生的环境条件以及痕量制造商的行为和身份。沟槽砂岩下方和上方的泥岩相连包括红褐色，含有含有Rhizohaloes，氨基苯甲酸和大型光滑的含有rhizohaloes的古溶胶，以及含有植物化石的薄层的有机富含Halles的含有rhizohaloes的古溶胶。砂岩相厚94-147厘米，薄薄的薄层，细致至中等粒度。锂外缩放被解释为裂缝剧，废弃渠道和远端泛洪平的沉积物。六十洞穴由垂直，复合，j形，y形和复杂的分支轴和隧道网络组成。洞穴的长度为5至180厘米，宽度为0.8-3.6cm。主轴的角度通常为约90°，但很少30-70°。复合角和Y形挖洞的分支角度从0到90°变化。许多洞穴延伸到砂岩床的顶部，但其他人变成或走出床。洞穴的形态与柬环境剧本（斜视）最相似，斜视>斜体>从近期的大陆存款中闻名。虽然斜视> camborygma 以前从二叠纪报道，这是浅古生代阿巴拉契亚盆地延伸其地理范围的第一次出现。 Dunkard Burrows类似于现代淡水Decapo

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