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1964年夏,笔者等在甘肃永昌北山马家湾一带的二迭纪石盒子群及石千峰组中分别发现有数层火山碎屑岩。
In the summer of 1964, I found several pyroclastic rocks in the Permian Shihezi and Shiqianfeng formations in Majiawan, Beishan, Gansu Province.