The exposure age of an Egesen moraine at Julier Pass, Switzerland measured with the cosmogenic radionuclides Be-10, Al-26 and Cl-36

The Egesen moraine complex on the east side of Julier Pass has a mean exposure age of 11,100 years. The exposure age is based on accelerator-mass-spectrometry-measured concentrations of Be-10, Al-26 and Cl-36 in six different boulders. Three of the boulders lie along the sharp-crested outer lateral moraine and have a mean exposure age of 11,800 years. This moraine wall represents the glacier's response to the climatic collapse at the Very beginning of the Younger Dryas. The other three boulders are located along a hummocky boulder band that cross-cuts the outer moraine along its terminal front. The exposure age of the inner moraine is 10,400 years.