Barcelona Hills (Catalan Coastal Ranges)

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The hills of Barcelona are located between the Quaternary littoral plain, where the old part of the city was settled, and the Collserola range. In the hills, a succession of Paleozoic rocks affected by a number of tectonic episodes is preserved (Variscan orogeny, Mesozoic extension, Paleogene compression and Neogene extension). The small size of the mappable units is a scientific challenge. Some of the best outcrops are in Park Güell, a good reason for that geologists visited the work of the famous architect Antoni Gaudí.

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Variscan and Alpine structure of the hills of Barcelona: geology in an urban area

Ribes Blaves gauge (Catalan Coastal Ranges)

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The boundary between the Catalan Coastal Ranges to the margin of the Valencia Trough is a staggered fault of hundreds of miles. Affects the Hercynian basement and has a complex history. Paleogene was to act as a directional fault, while during the Neogene acted as a normal fault with a jump of thousands of feet.
This led to a severe strain gauges of the most paradigmatic of Europe, with a high scientific and scenic value. Discontinuously along the outcrops of about 30 km, and between Esparraguera to Terrassa. One of the most spectacular is Ribes Blaves (Olesa de Montserrat).