Dolerite Dikes in Koster Islands
Photo: Thomas Eliasson of Geological Survey of Sweden |
Apophyses (branches) of dark-coloured dolerite dikes in Kosterhavet National Park on Ramsö island in the Koster Islands in Sweden. The dykes intruded between the Gothian orogeny (1.64 to 1.52 Ga) and the Sveconorwegian orogeny (1,2 to 0.9 Ga) at about 1.44 Ga.