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中奥陶世末,本区整体上升,长期处于剥蚀阶段。直到中石炭世再度遭受海侵。海水从东向西波及亳县—蒙城一线以东,在奥陶系古风化剥蚀面上形成了铁铝层。晚石炭世频繁的海进海退,在本区形成了海陆交互相的含煤沉积,亳县—蒙城一线以西在寒武—奥陶系风化剥蚀面上沉积了铁铝层,在该层中发现了斜方鳞木Lepidodendron posthumii Jongm.et Goth.,在其上覆的地层中发现了缪勒氏球希瓦格(竹蜓) Sphaeroschwageroschwagerina moelleri Rauser.,故该层时代为晚石炭世,缺失中石炭统沉积。在亳县—蒙城一线以东的铁铝层中发现了脉网羊齿 Linopteris neurop-teroides(Gutb.)Pot.,故其时代为中石炭世。为此本区奥陶系古老风化剥蚀面上铁铝层从东向西是一个穿时的岩石地层组合带。
At the end of the Ordovician period, the whole region has risen and is at an eroded stage for a long time. Until the Carboniferous suffered another transgression. Seawater flows east to west and east of Bo county-Mengcheng line, forming an iron-aluminum layer on the ancient weathered and denudated surface of the Ordovician. In the late Carboniferous, the frequent sea-going regression led to the formation of sea-land interbedded coal deposits in this area. The iron-aluminum layer was deposited on the Cambrian-Ordovician weathering and denudation surface to the west of Bo county- Found in the overlying strata Lepidodendron posthumii Jongm.et Goth., Found in the overlying formations of the Mulleys ball Schwäghig (bamboofly) Sphaeroschwageroschwagerina moelleri Rauser., So the age of this layer is Late Carboniferous, the lack of carbon System deposition. Linopteris neurop-teroides (Gutb.) Pot. Was found in the Fe-Al layer to the east of the Bo county-Mengcheng line. Therefore, its epoch was Carboniferous. For this reason, the ancient weathered and denuded surface of Ordovician iron-aluminum layer in the area from east to west is a combination of rock strata.