《徐霞客游记·粤西游日记三十一》
洞口以内，裂隙向西北弯隆而起；洞口以外，裂隙从石崖向山麓下坠。
门以内，隙向西北穹起；门以外，隙从崖麓坠下。
Inside the cave opening, the cleft arches and rises towards the northwest; outside the cave opening, the cleft falls from the stone cliff to the foot of the mountain.