columnar basalt iceland
Iceland: Basaltic flood basalts with typical columnar joints Giant's: Coastal exposure of columnar basalt, at Giant's Causeway, County Antrim, N Ireland.This is a world heritage site. Age of the lavas is Paleogene (50-60 ma). Taos: Flood basalts filling the Rio Grande Rift valley, N of Taos NM. Web. Web. Web. A half a kilometer cliff of hundreds of basalt column stacks …