The Súria anticline -el Mig-món- (Ebro Basin, deformed foreland)

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In the centre of the Ebro basin are potent saline deposits covered by thick alluvial continental sequences.
Around the upper Eocene, Pyrenees progress tectonically affected areas located almost in this area. Evaporitic deposits acted as detachment level of the upper strata favouring the formation of folds and thrusts. Salts, with their ability to accumulate and ascending flow forming large domes.
The Mig-món anticline is a fold formed by the diapiric rise described above.

Croscat volcano (Ebro Basin, deformed foreland)

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Croscat is one of forty volcanoes Volcanic Area Garrotxa. Special importance that is given by the following facts:

1. Is the largest strombolian conus in the Iberian Peninsula (160 m high and 800 m in diameter).

1. Is the youngest volcano in the Iberian Peninsula (the last eruption has only about 11,500 years).

1. A part of conus was exploited, opening an interesting outcrop which today allows a detailed observation and has a high educational value.

1. Led to an lava outflow of 20 km2, type aa. About this is the casting of the Jordà beechwood, a most interesting mature forests of Catalonia.

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Guia de la zona volcànica de la Garrotxa

Basaltic cliffs of Castellfollit de la Roca (Ebro Basin, deformed foreland)

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The basaltic cliffs of Castellfollit de la Roca are a one of the sites most popular of Catalan geological heritage thanks to its unique beauty. It is located in the Volcanic Zone of the La Garrotxa, comprising more than 40 Quaternary volcanic cones in excellent condition.
The cliff is formed by overlapping two volcanic lava flows invaded the valley of the river Fluvià. Later, the river dug this obstacle and describes this remarkable precipice. One of the most notable is the disjunction in its hexagonal columns.