Fodor's Expert Review Flysch

The Flysch is the crown jewel of the Basque Coast Geopark, a 13-km (8-mile) stretch of coastline distinguished by spectacular cliffs and rock formations. Taking its name from the German word for "slippery"—a reference to the slipping of tectonic plates that thrust the horizontal rock layers into vertical panels—the Flysch contains innumerable layers of sedimentary rock displaying some 20 million years of geological history. One such layer is black and devoid of fossils; it was identified by scientists as marking the Cretaceous–Paleogene extinction event, which caused the extinction of the dinosaurs.