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
Fingal Head, New South Wales a rocky uninhabited island first charted by James Cook in 1770. The stretch of water to the island is called the "Giants Causeway", named after the famous Giants Causeway between Northern Ireland and Western Scotland. Cook Island was made a marine reserve in 1998 and as such fishing is prohibited in the waters nearby. There has been controversy over the naming of Fingal Head by James Cook in May 1770 for many years. Strong evidence suggests that Fingal Head was, in fact, the point James Cook named Point Danger. In 1823, John Oxley took shelter from Southerly winds, while sailing