GPS: 41.057778, -6.898333

This natural heritage set includes multiple folds in a micro, macro and mesoscopic scale in the quartzites of the Lower Ordvician (about 480 million years ago), outcropping in the valley of the Mosteiro creek. This sequence of rocks formed in shallow seas that limited the continent Gondwana, is crowned by a vertical quartzite strata about 20 m in height, locally known as Muro de Abalona (Abalona Wall Wall).