Playa de Gorrondatxe y estratotipo del Luteciense Nature · Getxo, Bilbo Handia / Gran Bilbao, Bizkaia Image of Getxo, not of the place itself. Gorrondatxe beach holds the Global Boundary Stratotype Section and Point (GSSP) of the Lutetian stage, dated to 47.8 ± 0.2 million years, an international reference for the study of the Eocene. 47,8 millones de años (edad de referencia geológica) Photo: Zarateman (CC0) What to see and do in Getxo