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
Bodorna Rock Columns Natural Monument possibly in the V – VII centuries, and later during Timur's invasions of Georgia. The Georgian Chronicles reports that Timur's archers descended the column using ropes and shoot their arrows into the crowded cave. Nearby slopes has many similar man-made caves scattered around. Entire cave complex enjoys same protection as natural monument. Bodorna Rock Columns Natural Monument Bodorna Rock Columns Natural Monument () is a rock pillar with a height of 15 m and diameter 4 m near village Bodorna of Dusheti Municipality, Mtskheta-Mtianeti Georgia at a distance of 70-80 m from the S3 highway (Georgia) at 813 m above