Yes, presumably behind the wood was some sort of elevated rocky outcrop.
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Newguest--- Does it mean that over the wood there was a layer of rocks?We'd probably say "above the forest."
AvangiWe'd probably say "above the forest."
"A layer of rocks over the wood" could be taken as " - - rocks piled on top of the woodpile."
NewguestWhat about "over the forest"? Is it as good as "above ..."?In my opinion, not in this case. (Reminds me of a horribly contentious thread we had about "below the house" vs. "beneath the house.")