《徐霞客游记·粤西游日记二十》
深入半里，左壁上有石痕横亘着，叫做仙床，高悬地面一丈左右。
入半里，左壁有痕横亘，曰仙床，悬地丈许。
After going half a mile deep, there was a stone mark horizontally on the left wall, which was called the "immortals' bed", hanging about three feet above the ground.