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 the Angel Cave of the Angel The Cave of the Angel refers to several cave-related structures placed at Aras mountain range at the town of Lucena, Córdoba province in Spain. Here, it is located an Acheulean site that spans from the Middle Pleistocene to the Upper Pleistocene. There are geological, paleontological and archaeological evidences indicating an intense and long term occupation of this site. The study of numerous bone and lithic remains found in this site reveal exposure to fire. This along with the finding of a wide and deep combustion structure in the stratigraphic profile support the hypothesis that at the