by WPorre | May 26, 2016 | Rocky Shore
Rocky Shore Fissures and cracksPersistent wave action will widen fissures and cracks in some...
by WPorre | May 26, 2016 | Rocky Shore
Rocky Shore Cavities in these amphibolite rocksCavities in these amphibolite rocks at Hellestø are formed by chemical action in small air pockets within the...
by WPorre | May 26, 2016 | Rocky Shore
Rocky Shore AmphibolitesAmphibolites are rich in the greenish-black mineral called hornblende. These rocks are metamorphosed lavas which were the result of volcanic activity in the Jæren area many hundreds of millions of years ago....
by WPorre | May 26, 2016 | Rocky Shore
Rocky Shore Quartz-diorite, granodiorite and graniteQuartz-diorite, granodiorite and granite can be found as lenses, veins and “bodies” embedded in the mica-rich gneiss rocks. These are even more intensely metamorphosed than the formations around them....
by WPorre | May 26, 2016 | Rocky Shore
Rocky Shore Fine-banded gneissFine-banded gneiss is formed when phyllite is metamorphosed. It contains much larger amounts of the greyish-white or pink mineral feldspar than the other gneisses we find in Jæren, and is thus lighter in colour. You can see a clear...
by WPorre | May 26, 2016 | Rocky Shore
Rocky Shore Greenstones and greenschistsGreenstones and greenschists were originally volcanic ash and lava deposits later subject to low grade metamorphism. They are greenish-grey in colour and are often found together with quartzites and marbles. The islands of...
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