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(Petroglyphs and Petrographs of Angono, Rizal)
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These inscriptions clearly show stylized human figures, frogs and lizards, along with other designs that may have depicted other interesting figures but erosion may have caused it to become indistinguishable. The engravings are mostly symbolic representations and are associated with healing and sympathetic magic.
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The site has been declared by the National Museum of the Philippines as a National Cultural Treasure in 1973. It is also included in the list of the World Inventory of Rock Art in 1985 and historic sites of the World Monuments Watch and World Monuments Funds and part of the Philippines' tentative list of the UNESCO World Heritage Site.
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The existence of a rock shelter was reported to the National Museum by the late National Artist of the Philippines <a href="https://kahimyang.com/kauswagan/articles/2820/12-of-botong-franciscos-best-and-most-recognizable-paintings" class="news_link">Carlos "Botong" Francisco</a> in March 1965 during a field trip with several boy scouts along the boundaries of Angono, Binangonan and Antipolo of the province of Rizal. Since then, some rock carvings have been damaged due to neglect and vandalism. 
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In 1973, by virtue of Presidential Decree No. 260, it was declared as a national cultural treasure by the Philippine government. During that time, a team led by the National Museum of the Philippines started archaeological site conservation and site development of the petroglyphs in which a mini-museum, view deck and stone path, among others, were constructed. It was included in the list of National Cultural Treasures in 1973 and World Inventory of Rock Art in 1985.
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In 1996, The World Monuments Fund included Angono Petroglyphs on its list of preservation projects and has helped with the installation of a drainage system and assigned a caretaker to protect the site. The site is also on the tentative list of UNESCO World Heritage Sites of the Philippines.
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The Angono Petroglyphs is located in a shallow rock shelter. It measures 63 meters wide, 8 meters deep and a maximum height of 5 meters. It has been created due to faulting and formed in volcanic soil during the Quaternary period. There are 127 drawings in the form of animate and static figures of circular or dome-like head on top of a "V" shaped torso distributed on a horizontal plane on the rock wall area measuring 25 meters by 3 meters. Only 51 of the total 127 drawings are distinct. Due to the complexity and plurality of the drawings, it is suggested that the drawings on the rock were not only created by a single individual. It is widely believed that the figures drawn on the walls are for healing purposes as the site is a "dambana" or sacred grounds regarded as holy within the indigenous Philippine folk religions. Researchers have argued that the figures were medicinal and religious in function as they were made by ancestors to transfer the sickness of a child onto the limestone wall, thus, curing the child from ailments.
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Petroglyphs carved into a rock wall in Angono probably engraved before 2000 BC