Sliprännor i Gantofta

Sliprannor i Gantofta is a sandstone outcrop near Helsingborg in Scania, Sweden, covered with grooves along the Raa river valley escarpment [1] [2]. Once thought to be marks from sharpening weapons, modern scholars have disproven this theory [3] [4]. Other hypotheses propose stone flour production [3] [5].