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
Booker T. & the M.G.'s Steve Potts. The band was inducted into the Rock and Roll Hall of Fame in 1992, the Musicians Hall of Fame and Museum in Nashville, Tennessee, in 2008, and the Memphis Music Hall of Fame in 2012. Having two white members (Cropper and Dunn), Booker T. & the M.G.'s was one of the first racially integrated rock groups, at a time when soul music and the Memphis music scene in particular were generally considered the preserve of black culture. Booker T. & the M.G.'s formed as the house band of Stax Records, providing backing music for numerous singers, including Wilson