《晋书·志·第十八章》
孝怀帝永嘉元年二月，盗墨东北楚庐旦地面塌陷，有灰白两种颜色的鹅出来，灰色的飞翔冲上天空，白色的留下来。
孝怀帝永嘉元年二月，洛阳东北步广里地陷，有苍白二色鹅出，苍者飞翔冲天，白者止焉。
In February of the first year of Emperor Xiaohuai's Yongjia period, the ground of Daomonei Donglu collapsed in the northeast, and geese of two colors, gray and white, emerged. The gray ones flew up into the sky while the white ones remained.