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 Ramban Cave of the Ramban The Cave of the Ramban is located in the southern cliff of the Upper Kidron Valley, on a slope descending into the Arab neighborhood of Wadi al-Joz, Jerusalem. It is believed by some to be the traditional burial place of Nahmanides (also known as Ramban), a foremost rabbinical scholar during the medieval era. The large rock-hewn cave, measuring 19 by 20 m, reaches a height of 3.5 meters and is supported by two columns. The area once functioned as an ancient underground stone quarry. Above the façade, in the upper portion of the cliff, are the