公乐亭泉出露于蓟县系雾迷山组白云岩地层与第四地层接触部位，为溢出泉。

Gongleting spring emerges at the contact place between the dolomite of wumishan formation, jin system and the stratum of quaternary system and is an overflow spring.

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甘肃省肃北县马宗山乡平头山北坡，出露一套变质碎屑岩。1968年，甘肃省区调二队将它划归蓟县系平头山群上岩组；

There outcrops a sequence of metaclastic rocks on the north slope of Mount Pingtou at Mazongshan Town-ship, Subei county, Gansu province.

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甘肃省肃北县马宗山乡平头山北坡，出露一套变质碎屑岩。1968年，甘肃省区调二队将它划归蓟县系平头山群上岩组；

There outcrops a sequence of metaclastic rocks on the north slope of Mount Pingtou at Mazongshan Town-ship, Subei county, Gansu province.

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