Picking up a bit of a cave like signal at the purple circles. In #1 pic circle is the entire area, in #2 spot more like a room or passage, in #4 pic small bottom circle either ends or if the waterfalls has a cave behind it, might enter there. Are any caves or openings in the pics? If not, could be nothing more than a small natural cave back inside the rock. The green circles for archaeological signals, seems to be at the edge of your red circles. You might not be able to reach the carvings, was wondering if a small hiding place could have been made at both, then sealed off. Otherwise signal is from the carving or this could indicate perhaps something (probably artifacts), in a cave, might have a concealed entrance.