Fig. 14

Schematic paleogeographical sketch map of the LGM ice build-up situation (a) and of the relative oldest glaciation ( b) causing overdeepening in the Hopfgarten basin. a The situation when overdeepening in the basin of Hopfgarten stopped due to the blockade by the Achen glacier, which at that time already got an strong supply via the low transfluence route of Pass Thurn from the Salzach glacier. b In contrast during an older glaciations (before Termination II + x), the Achen glacier was not able to do imped glacier flow towards east due to a relatively high elevated ice transfluence route, which did not allow such a strong inflow of ice from the south as it had occurred at the beginning of the LGM. Such a paleogeographic situation allowed unimpeded advance of Inn and tributary glacier towards east resulting in substantial overdeepening during this phase