stream bed, natural stone water channel growth in forest

abstract anomaly bed calcareous carbonate channel channeling course creek current dam deposit environment feature flow flowing flows forest formation geographical geologic geological germany groove gully high hollow increase increasing kalksockel lime limestone lithic miracle monument moss natural nature outstanding petrified phenomena rarity rill rinne rivulet runlet runnel running scale sinter steinerne stone stream streamlet syncline top trough tufa tufaceous unique vegetation wall water watercourse waters wolfsbronn wonder woods ecosystem grow growing growth small detail