Augusto F Villalon and the National Museum of the Philippines
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The petroglyphs are engraved on the back wall of a rock shelter 63 meters wide, 8 meters deep and 5 meters at the highest point. The engravings are in a horizontal plane measuring 25 by 3 meters. There are 127 engraved animate figures, 7~O of which are concentrated centrally. Archaeological wirk in the area yielded both Neolithic and Paleolithic tools with fragmented pottery, with an estimated date of approximately 2,000 B.C.