《宋书·志·卷二十八》
泰始三年四月戊午曰，有司上奏说： 张掖太守焦胜说，氐池县大柳谷口出现了青龙。 
泰始三年四月戊午，有司奏： 张掖太守焦胜言，氐池县大柳谷口青龙见。 
In the 4th month, on the day of Wuwu in year 3 of the Taishi era, the relevant authorities memorialized the court, saying: Jiao Sheng, the prefect of Zhangye said that an azure dragon has appeared on the mouth of the Daliu Valley in Tucheng County.