《徐霞客游记·黔游日记六》
到了山崖下，就见一个巨洞弯隆，洞口向北，洞内从高空凹陷下去，非常大。
抵崖下，则穹然巨洞，其门北向，其内陷空而下，甚宏。
When I got to the foot of the cliff, I saw a huge cave with a curved ridge, the entrance facing north, and the inside of the cave hollowed out from a high altitude, which was very large.