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NORTHWEST Sichuan, a hotspot for geologic study, recently has yielded a series of large-medi-um scale gold deposits in the Upper Triassic. It is of great importance to determination andsubdivision of the Triassic System and eventually to exact locating of the gold deposits.The Triassic Zagunao Formation in northwestern Sichuan has greatly changed in sensesince it was named in 1961. Now the Zagunao Formation only includes the metamorphic sand-stone with interlayers of slate lying between the Zhuwo Formation (T_3) and the Zagashan For-
NORTHWEST Sichuan, a hotspot for geologic study, recently has yielded a series of large-medi-um scale gold deposits in the Upper Triassic. It is of great importance to determination and subdivision of the Triassic System and eventually to exact locating of the gold deposits. The Triassic Zagunao Formation in northwestern Sichuan has greatly changed in sensesince was was 1961. Now the Zagunao Formation includes only metamorphic sand-stone with interlayers of slate lying between the Zhuwo Formation (T_3) and the Zagashan For-