Silver spring in Vlčí rokli

A spring of water, flowing directly into the Skalní (sometimes also Vlčí) stream in Vlčí rokli, connecting Teplické and Adršpašská rocks. The spring is interesting in that it rises partly through the sandy bottom of the stream and thus creates small craters of silvery sand (see photos 3 and 4). There is a yellow-marked hiking trail nearby, described for example here: https://www.turistika.cz/turisticke-trasy/detail/do-adrspassko-teplickych...