'Rocks' in the Bible

When the men of Israel saw that they were in a strait, (for the people were distressed,) then the people did hide themselves in caves, and in thickets, and in rocks, and in high places, and in pits.

Then Saul took three thousand chosen men out of all Israel, and went to seek David and his men upon the rocks of the wild goats.

Look! you have seen today how the Lord gave you up into my hands even now in the hollow of the rocks: and some would have had me put you to death, but I had pity on you: for I said, Never will my hand be lifted up against my lord, who has been marked with the holy oil.