Rock art, one of the most ancient forms of human artistic expression that has been preserved over the ages since its creation, can give us a window into the minds and lives of our human ancestors. The oldest rock art dates from the Upper Palaeolithic, exemplified by the famous cave paintings in France and Spain, where minimum ages of 41 ka BP (before present) have been documented (Pike et al., 2012), as well as those in the Indonesian archipelago, with minimum ages of 44 ka (Aubert et al., 2019). These images were produced by applying pigments to rock surfaces, creating socalled pictographs, which can be dated either by radiocarbon measurements of the charcoal pigment used or by uranium-series dating of the speleothems that cover the images. Here we focus on another type of rock art: petroglyphs, which are produced by removing dark crusts, so-called rock varnish, from rock surfaces and exposing the lighter coloured host rock underneath. Petroglyphs are found on all continents inhabited by humans (e.g.