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龙吟组底部即出现Popanoceras菊石群,表明其时代为二叠纪阿丁斯克期;马平组上部除阿谢尔期外,至少还包括有整个萨克马尔期沉积。
The Popanoceras ammonites appear at the base of the Longyin Formation, indicating that the age was the Permian Agenskian period; the upper part of the Maping Formation included at least the entire Sacher-Malian deposition in addition to the Ascochian period.