下扬子区中二叠统地层。代号P2g。 特征为硅质岩、硅质页岩、粉砂质泥岩、碳质页岩，下部页岩含锰及磷结核。下部产牙形石： Jinogondolella nankingensis等；腕足类：Neoplicatifera huangi组合；菊石： Altudoceras-Paragastrioceras?组合及双壳类、放射虫等。属台盆相沉积。下与栖霞组、上与龙潭组均为整合接触。厚23米，区域厚度10-107米。
这一发现同时支持孤峰组形成于局限浅水环境的观点。
This discovery supports the view that the Gufeng Formation was deposited in a restricted shallow water environment.
铜陵花树坡铜矿床主矿体赋存于二叠系下统栖霞组硅质层内，次要矿体赋存于孤峰组内，受层位控制。
The main orebody of Huashupo Copper Deposit in Tongling occurs in silica horizon of Qixia Group of Lower Permian System, while minor ores controlled by strata occur in Gufeng Group.
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