This slope was bare rock exposed in July 2005 while he was working on the development work for the promotion of 42 new homes (including in the Barcelona Housing Plan 2004-2010) of Avenida República Argentina. 102.
This outcrop geological substrate Barcelona belongs to the Paleozoic Era. The subsoil of Barcelona comprises ancient rocks (between 500 and 300 million years ago) that form the upper part of the city and the Sierra de Collserola and younger rocks, Neogene age (25 million years -Current importance), which constitute the flat Barcelona a set of faults parallel to the coastline they contact these rocks and steps the city to the sea.
This slope is one of the few preserved outcrops of Paleozoic rocks. On the right, there Devonian limestone ocher and left, dark Silurian shales. These materials are separated by a fault zone consisting of red and slate gray.
Having brought together the same effort between City Council and the Faculty of Geology of the UB (Barcelona) reflects the determination to preserve natural heritage elements of interest and disclose them to the public, to allow Barcelona see the beauty of the living rock, and at the same time, the evolution of the subsoil of the city of Barcelona.