Aerial photo 1982: the huge terminal moraine of 1860 (end of Little Ice Age) is very prominent. An ancient route towards Sustenpass follows the moraine (bottom). Until 1912 recession took place but was followed by a re-advance, culminating in the formation of the moraine of 1920. During the next recession Steisee (centre) was formed. This recessional phase ended around 1970 (approx. snout position indicated), after which the tongue advanced again towards Steisee. Then recession set in again, and in 2006 the position of 1970 was reached once more.