- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
"At South Hill, 1/2 mile southeast of St. Helier, two hornblende-mica-lamprophyre dykes cut the Fort Regent granophyre. They are themselves displaced by two gently dipping shear zones and a dolerite dyke belonging to the main Jersey dyke swarm cuts the granophyre, lamprophyres, and shears. Petrographically the lamorophyres are of the spessartite-kersantite type, but the presence of euhedral brown amphibole invites comparison with the camptonites. The genesis of the lamprophyres is discussed and a significant role is assigned to volatile constituents."