 S. S. FIGUEIREIDO’s scientific contributions

... Where occupation evidence was excavated above the river's flood zone it always featured ceramics and microliths down to bedrock ( Zilhão et al., 1997;Aubry et al., 2002). This stands in stark contrast to the Sabor valley, north of the Douro, where in one excavation 125,000 Upper Palaeolithic stone artefacts and over 1400 fragments of engraved plaquettes were recovered, but where not a single petroglyph occurs ( Figueiredo et al., 2014). There are no depictions of extinct animals among the hundreds of zoomorphs on the Côa, most of which feature equine (including specimens wearing a bridle) and bovid characteristics. ...

Reference:

Equine petroglyphs in Europe