stony embossed rocks of the rhone glacier at furka pass, valais, switzerland.

abrasion alpine alps bedrock boulder detail embossed end erosion europe formation free front furka furkapass geology glacial glacier glaciology gray grey ice landform landscape mountain mountains moutonnée movement natural nature oberwald pass polish retreat retreating rhone rhône roche rock rocks stone striae striation striations structure surface swiss switzerland terminus texture urner valais wallis