The Giant's Causeway

BGS image ID: P006483

Giant's Causeway. Looking SE. Columnar jointing in tholeiitic basalt. The columns are usually from five to seven sided with ball and socket cross-joints. 
Old photograph number: NI00708

BGS image ID: P225384

Giant's Causeway. Looking SE. Columnar tholeiitic basalt, showing ball and socket cross-jointing. The cross-joints are upward and downward facing in apparently random pattern.
Old photograph number:  NI00706

BGS image ID: P225386

Giant's Causeway. Looking N. The Middle Causeway. Columnar tholeiitic lava.
Old photograph number:  NI00710

Bob McIntosh