Many thanks to Ioannis Hadjiliadis from Hotel Albatros in Livádhi and his brother Demetrios Hadjiliadis for great hospitality and logistical support. ANAVASI, the publisher of the detailed topographic Serifos map, provided digital data for our work. Greek Institute of Geology & Mineral Exploration (IGME) and the local authorities of Serifos kindly provided us the permission to work on the island. We acknowledge numerous discussions in the field with Neil Mancktelow, Dani Schmid, Dave Schneider and Marcin Krotkiewski. The work was funded by the FWF Austrian Science Fund grant number P18823-N19.