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 Winds (New York) Falls with water crashing down right on them and flowing beneath the decking. The decking is removed each fall due to the potential damage caused by ice buildup at the falls and re-installed each spring by park officials for sightseers to enjoy the experience. The decking is not secured to the rocks below by bolts or other construction materials; the wood beam supports are simply wedged into the rock crevices. Cave of the Winds (New York) The Cave of the Winds was a natural cave behind Bridal Veil Falls at the Niagara Falls. The cave was some high, wide and