Glarus Thrust at Martin's Hole

Two weak layers intersect in the legendary Martin's Hole: a soft, flat, dark marl layer and a steep fracture surface. Erosion in this area was able to quickly remove the limestone, creating Martin's Hole with a diameter of more than 15 metres. On two days each in spring (13-14 March) and autumn (1-2 October), the sun's rays hit the church of Elm through Martin's Hole.