His fingers found no hold in the stone surface.
The effect was of light passing over a flat stone surface for a moment.
I stepped back, and my feet met a flat stone surface.
A very small piece of the stone surface next to the slab was also loose.
A socket for the key had appeared in the stone surface when no one was watching.
He looked down and saw that it was a good half inch off the stone surface now, still supported by something on the inside.
He seemed to have trouble making contact with the stone surface.
His voice made the stone surfaces in the cave ring.
Ages ago a series of symbols had been painted on the stone surface.
Sliding over to the wall, she sat up and rested her back on the smooth stone surface.