Makatau mountain, which is situated approximately 3 km outside Aishalton village, is one of Guyana's most well-known archaeological sites. It is particularly well known for the numerous petroglyphs (known locally as "timehri") that are found on Makatau and on rock-formations in the surrounding area. In the 1970s, the Guyanese anthropologist, Denis Williams, undertook a detailed archaeological study of the area. His research uncovered 686 petroglyphs (known as the "Aishalton Petroglyphs") that are mainly representations of humans, animals and plants as well as geometric arrangements.Williams estimated the date of the petroglyphs at 3000–5000 BCE, and described them as belonging to a specific "type" of petroglyph—subsequently referred to as the "Aishalton type"—that is defined by a distinctively figurative style. Williams also discovered 84 stone tools that had been used in the carving of the petroglyphs. They were the first tools of this kind to be found in Guyana