Magma Detail From Penedo Do Lexim, Mafra, Portugal. Stock Image

Detail from the volcanic complex of Penedo do Lexim, nearby Mafra and Sintra. This is part of the Lisbon volcanic complex, a part of the second pulse of alkaline magmatic activity of the Upper Cretaceous. This chimney is exceptionally well preserved and occupies a prominent position in the relief of the region. The existence of a cut derived from old extractive activities created excellent conditions for the observation of the prismatic disjunction that characterizes this chimney.