【摘要】 本文系统研究了贵阳乌当下奥陶统湄潭组遗迹化石,认为这些遗迹化石系风暴沉积前后的产物,并首次在我国发现cruzianc furcifera 遗迹组合,这对于地层对比,遗迹组合的地理分布均有重要意义.更多还原

【Abstract】 The lower Ordovician trace fossils described herein were first found in Wudang, Guiyang. They contain 10 ichnogenera, 11 ichnospecies, of which 2 ichnospecies are new(Limulicubichnus wudangensis ichnosp.nov. Yang, and Cru-ziana wudangensis ichnosp.nov.Yang.). Trace fossils of the Meitan Formation are of storm-related ichnofacies, containing two different trace fossil associ-ations. The Skolithos ichnofacies, consisting of Skolithos ichnosp. and Diploce-raterion ichnosp., in the lower part of the Meitan Formation. The Cruziana. ichnofacies, containing Cruziana furcifera D’Orbigny, Cruziana wudangensis ichnosp. nov. Yang, Phycodes cf. Circinatum Richter, Limulicubichnus wuda-ngensis ichnosp.nov. Yang, Lockia siliquaria James, in the upper part of Mei-tan Formation. The Skolithos ichnofacies represents the flourishing of a com -munity of opportunistic organisms with low-diversity in an environment of unstable high stress. The Cruziana ichnofacies represents a stable benthic community with a high diversity.更多还原