Robuta

https://www.usgs.gov/publications/bokan-mountain-peralkaline-granitic-complex-alexander-terrane-southeastern-alaska Bokan Mountain peralkaline granitic complex, Alexander terrane (southeastern Alaska): evidence for... The circular Bokan Mountain complex (BMC) on southern Prince of Wales Island, southernmost Alaska, is a Jurassic peralkaline granitic intrusion about 3 km in... alexander terranesoutheastern alaskabokanmountainperalkaline