Giant's Causeway cases the horizontal fracture has resulted in a bottom face that is convex while the upper face of the lower segment is concave, producing what are called "ball and socket" joints. The size of the columns is primarily determined by the speed at which lava from a volcanic eruption cools. The extensive fracture network produced the distinctive columns seen today. The basalts were originally part of a great volcanic plateau called the Thulean Plateau which formed during the Paleocene. According to legend, the columns are the remains of a causeway built by a giant. The story goes that the Irish
Cave of El Soplao varied columns. As in the Galería of the Cauliflower can be seen traces of an earthquake. Located to the east. It is one of the highest, reaching 30 metres high. Its length exceeds 160 metres. Notable cast sheets, giant stalagmites pisolithic nests. Its name comes from the number of colours displayed on it, because of the variety of salts dissolved in water. This is the list of minerals and fossils found in the cave, in alphabetical order: Cantabrian Speleogical Club "The Cave of El Soplao, an unique cave" (1987) Cave of El Soplao El Soplao (Cantabrian: El Soplau) is a