Abundant and moderately diverse trace fossil assemblage have been discovered for the first time in mudstones of the Pogorzala Formation from the Witoszow region, SW Poland. Fifteen ichnospecies including fourteen ichnogenera are described. The ichnofauna is dominated by Dictyodora liebeana and contains numerous Palaeophycus tubularis , rarer Archaeonassa fossulata , Archaeonassa isp., Chondrites cf. intricatus , Curvolithus simplex , Diplopodichnus biformis , Lockeia isp., ? Lophoctenium isp., Nereites isp., Phycosiphon isp., Protovirgularia isp., ? Psammichnites isp., Taenidium isp. and one ichnospecies of fish swimming trails, Undichna cf. britannica. Some other structures (wave ripples influenced by microbial mats and zigzag structures) also occur. The trace fossil assemblages differ in various exposures, but three of them are similar and display the Dictyodora liebeana ichnoassemblage. It is represented mostly by the ethological categories fodinichnia and repichnia, with fewer pascichnia, domichnia and cubichnia. This new data from the Świebodzice Unit sheds light on the palaeontology, age and paleoenvironment of the Pogorzala Formation. The occurrence of D. liebeana and U . cf. britannica indicates the Mississippian age of most mudstones studied, formerly considered Upper Devonian. The trace fossil assemblage belongs to the non-standard Nereites ichnofacies, without graphoglyptids. The lithological features of mudstones, trace fossil assemblage and poverty of macrofauna, testify to their deposition in a deeper sedimentation zone below storm wave base, most likely in dysaerobic, pro-delta conditions. This study suggests that rocks containing D. liebeana may form a correlative horizon in the Świebodzice Unit.

中文翻译：

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在来自 Witoszów 地区（波兰西南部）的 Świebodzice Unit 中首次发现密西西比遗迹化石

首次在波兰西南部 Witoszow 地区的 Pogorzala 组泥岩中发现了丰富且适度多样的痕迹化石组合。描述了 15 个 ichnospecies，包括 14 个 ichnogenera。鱼类群落以 Dictyodora liebeana 为主，包含大量的古藻、罕见的古生菌、古生菌、球粒陨石（参见图 1）。intricatus , Curvolithus simplex , Diplopodichnus biformis , Lockeia isp., ? Lophoctenium isp., Nereites isp., Phycosiphon isp., Protovirgularia isp., ? Psammichnites isp., Taenidium isp. 和一种鱼类游泳小径，Undichna cf。大不列颠。其他一些结构（受微生物垫和锯齿状结构影响的波浪纹）也会发生。微量化石组合在不同的暴露下不同，但其中三个是相似的，并展示了 Dictyodora liebeana ichnoassemblage。它主要以 fodinichnia 和 repichnia 为代表，较少有 pascichnia、domichnia 和 cubehnia。来自 Świebodzice Unit 的新数据揭示了 Pogorzala 组的古生物学、年龄和古环境。D. liebeana 和 U 的发生。参见 britannica 表明大多数研究的泥岩的密西西比时代，以前被认为是上泥盆纪。微量化石组合属于非标准浅海藻类地层，无graphoglyptids。泥岩的岩性特征、微量化石组合和大型动物群的贫乏证明了它们沉积在风暴波底部下方更深的沉积带中，最有可能是在厌氧、亲三角洲条件下。这项研究表明，含有 D 的岩石。