《晋书·帝纪·第三章》
夏四月十六日，张掖太守焦胜上奏说，氐池县大柳谷口一个地方有黑色石，石上有白色文彩，实是大晋吉祥的象征，把彩文画出来献给皇帝，下诏以制币祭告于太庙，图文收藏在天府。
夏四月戊午，张掖太守焦胜上言，氐池县大柳谷口有玄石一所，白画成文，实大晋之休祥，图之以献。诏以制币告于太庙，藏之天府。
On the 16th day of the fourth month of the summer, Zhangye Prefect Jiao Sheng reported to the imperial court, stating that there was a black stone with white patterns at a place at the entrance of the Big Willow Valley in the Di pool County. It was a very auspicious sign for the Great Jin Dynasty. The image of the patterns was drawn and presented to the emperor. An imperial edict was issued to have it cast as a coin, and it was then offered to the imperial ancestral temple. The drawing and the text were collected in the Imperial Archives.