《太平广记·卷三百九十八·石（坡》
夷道县有釜濑，那石大的像锅那样大，小的像斗那样大，形状和颜色和真的一样，只是中间是实的罢了。
夷道县有釜濑，其石大者如釜，小者如斗，形色乱真，唯实中耳。
There is a Bu Stream in Yidao county. The stones in it are as big as pots and as small as dippers. Their shapes and colors are just like real ones, except that their centers are solid.