《太平广记·卷三百六十六·妖怪八》
杜元颖镇守蜀地的时候，资州有一块一丈见方的大石头能跑能走，盘据了几亩地的地方。
杜无颖镇蜀年，资州方丈大石走行，盘礴数亩。
When Du Yuanying was garrisoning Sichuan, there was a one-zhang square stone in Zizhou Prefecture, and it could run and walk, occupying several acres of land.