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
Natural History Museum at the University of Oslo Garden contains 35,000 plants, 7,500 species and two exhibition greenhouses. The Geological Museum contain research material of more than 2 million fossils, rock specimens and minerals. A selection of specimens are on display in both the Geological Museum and the Zoological Museum. Among the attractions is the "Darwinius masillae" fossil "Ida", a primate from the Eocene Epoch. Natural History Museum at the University of Oslo The Natural History Museum at the University of Oslo (, NHM) is Norway's oldest and largest museum of natural history. It is situated in the neighborhood of Tøyen in Oslo, Norway. It traces its roots