Pleistocene
There are raised sandy or pebbly beaches along the coasts which have been partially cemented. These have been dated to 53,700 to 75,800 years old. Torca del Carlista has the largest cavern (La Grand Sala del GEV) in Europe. It is found in the Basque Country. It has an area of 76,620 square meters, with dimensions of 245 by 520 meters.
Read more about this topic: Geology Of The Iberian Peninsula