The Cuisance is a Jura river whose waters are loaded with bicarbonate and calcium. Its course is marked by significant deposits of tuff (limestone) in the Tufs waterfall of Planches-près-Arbois (photo) as well as upstream and downstream of the waterfall. The bottom of the channel of the river is made up of stones cemented in a tuff matrix which form travertine dams at the origin of numerous gours (water basins).