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In page Sichuan:

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The existence of a highly developed civilization with an independent bronze industry in Sichuan was excavated in 1986 at a small village named Sanxingdui in Guanghan, Sichuan.[6] This site, believed to be an ancient city of Shu, was initially discovered by a local farmer in 1929 who found jade and stone artifacts. Excavations by archeologists yielded few significant finds until 1986 when two major sacrificial pits were found with spectacular bronze items as well as artifacts in jade, gold, earthenware, and stone.[7] This and other discoveries in Sichuan contest the conventional historiography that the local culture and technology of Sichuan were undeveloped in comparison to the technologically and culturally "advanced" Yellow River valley of north-central China.[citation needed]