Marked rock over part of the chamber .
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Interesting, looks like someone caught a doodle bug and went for it. Doesn't seem like the usual type of stone for carvings.
Sadly the pic is not very clear , the stone could have done with some water but none available . Even for the area the markings were not quite typical . Immediate geology was very friable .
Love to get down to this part of Spain, weather looks great, what time of year did you visit? Any particular base or just touring?
The pics were taken in September /October , weather was warm but not too hot and mostly dry at all altitudes .
We have stayed in various places in the area , in October it was Ceret , just across the border .