We used cosmogenic 10 Be and 36 Cl to establish the timing of the onset of deglaciation after the Last Glacial Maximum of the Reuss Glacier, one of the piedmont lobes of the Alpine ice cap that reached the northern Alpine foreland in Switzerland. In this study, we sampled erratic boulders both at the frontal position in the foreland (Lenzburg and Wohlen, canton Aargau) and at the lateral Alpine border position (Seeboden moraine, Rigi, canton Schwyz). The minimum age for the beginning of retreat is 22.2 ± 1.0 ka at the frontal (terminal) position and 20.4 ± 1.0 ka at the lateral position. These ages are directly comparable with exposure ages from the other piedmont lobes in the northern Alpine foreland. Our data from the mountain called Rigi, do not support the hypothesis that boulders located external to the Seeboden moraine were deposited prior to the last glacial cycle. We present a first exposure age from an erratic boulder in a retreat position in the Alpine foreland. The Reuss Glacier was approximately 12 km behind the maximal extent no later than at 18.6 ± 0.9 ka.

Situated on the interior side of the western central Taurus Mountains of SW Anatolia, the Muslu Valley in the Dedegö l Mountains (Mt Dipoyraz: 378 37 0 07 00 N, 318 19 0 42 00 E, 2992 m above sea level (a.s.l.)) represents the lower part of a formerly glaciated valley system of $7.5 km in length. Surface exposure ages with cosmogenic 10 Be and 26 Al date a glacier expansion out of the Muslu Valley 24.3 AE 1.8 ka ago (1s confidence interval) and give evidence for pronounced glacier advances prior to the global Last Glacial Maximum (LGM; 21 AE 2 ka). Deglaciation commenced no later than 17.7 AE 1.4 ka ago. Superimposed climatic oscillations are indicated by glacier fluctuations dated around 19.8 AE 1.6 ka and again 13.9 AE 2.3 ka prior to the first major amelioration of climate. The Late Pleistocene glacier chronology from the western central Taurus Mountains, published lake level fluctuation data of palaeolake Konya and Lake Beyşehir, and nearby pollen data on the central Anatolian plateau reveal a conspicuous time correlation of palaeoenvironmental change.

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ABSTRACT. To study the past and future evolution of Rhonegletscher, Switzerland, a flowline model was developed to include valley shape effects more accurately than conventional flowband models. In the model, the ice flux at a gridpoint was computed by a two-

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