Pyrenees
The Pyrenees were formed as the Iberia plate impacted the European plate, it was partly subducted. Initial compression started in Santonian times with the thinned crust subducted. Crust to the west was subducted later. Thrusts were formed to the south resulted in inversion of the Mesozoic basins. The Central Pyrenees had the greatest shortening, with smaller amounts to the west. Shortening continued for 40 Ma. There are several Permian sedimentary basins, up to 1 km deep. These start with grey siltstone, coal and volcanics, and are topped with red siltstone, sandstone and conglomerate. At the end of Cretaceous there was about 150 km separation between Iberia and France.
Gavarine Thrust Sheet
- Jaca Basin (near Jaca) Eocene
- Ainsa Basin north of Ainsa Eocene (Sobrarbe Formation=delta, Escanilla formation=transition to alluvial, Collegats Formation=alluvial fan.
- Tremp-Graus Basin from Tremp to Graus Eocene
- Ager Basin Lower Tertiary
Read more about this topic: Geology Of The Iberian Peninsula