According to analysis of the features of litho-logy, Namurian palaeogeographic environment in the regions might be a deep basin in the shallow sea, in which the water was quiet and warm, dysaerobic, unstable and weak dynamic.

• 根据岩石学特征分析,本区纳缪尔期的古地理环境为温暖、贫氧、盐度不稳定、水动力较弱、能量较小的浅海深水盆地。