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Catalan central depression

Catalan central depression is the Catalan part of a first order morphostructural unit of the Iberian Peninsula called Ebro Basin or Depression. Catalan central depression or Tertiary Catalan depression is bounded to the north by the Pyrenees and to the south by the Catalan Coastal chain. It is filled with little deformed tertiary materials derived from the erosion of these Alpine chains that surround it. At the beginning sedimentation in the inside of the basin was marine and fluvio-marine (deltaic) in the margin. In the end of Eocene, the sea retreats and the basin becomes endoreic. Then many masses of salt principally concentrated in anticline folds nucleus are deposited. These folds, some of which are diapiric, were originated by the effect of the last orogenic pushes of the Pyrenees and the Iberian Chain. In the eastern end of the depression, where all the three units of relief meet, Catalan Central depression is affected by a normal fault system of NW-SE orientation that produce Empordà depression, filled with neogene materials. These fault systems are related with neogene distensional processes that affect all three morphostructural units.

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