Paleozoic Diamictites

The Valongo Anticline allows the observation of evolution of life during the Paleozoic, based on animal and plant fossils, as well as the possibility of dating the strata from the fossils they contain. It also presents some particular lithology evidence, namely the presence of icebergs, the existence of submarine volcanism, and the presence of beaches. The tectonic action is evidenced by the existence of folds and faults.
In this site it is possible to observe the variation in sedimentation environments (marine and continental) from nearly 540 to 300 M.y. Also, in this region we can find several outcrops with diamictites beds. This glaciomarine record of the Hirnantian (end-Ordovician) glaciation is evidence of the climate changes that occurred over Earth's history.