《徐霞客游记·黔游日记一》
山脊东面的峡谷中，有个山洞紧依着囤子所在的山麓，洞口向北，十分狭窄却很深。
脊东峡中，有洞倚囤麓，其门北向，甚隘而深。
In the canyon on the east side of the ridge, there is a cave close to the foot of the mountain where the stronghold is located. The entrance of the cave faces north. It is very narrow but deep.