Robuta

https://dggs.alaska.gov/pubs/id/28004 Hagen-Leveille, Janice, 1987 - A statistical study of Alaska skarns with application to resource... https://www.usgs.gov/publications/stable-isotope-studies-metasomatic-ca-fe-al-si-skarns-and-associated-metamorphic-and Stable isotope studies of metasomatic Ca-Fe-Al-Si skarns and associated metamorphic and igneous... Garnet-pyroxene skarns were formed 90 m.y. B.P. in the Osgood Mountains at or near contacts of grandiorite with calcareous rocks of the Cambrian Preble...