The Ancient Volcanoes of Great Britain, Volume 1 (of 2)
CHAPTER VI
Underground Phases of Volcanic Action--_continued_. II. Subterranean Movements of the Magma: i. Dykes and Veins; ii. Sills and Laccolites; iii. Bosses (Stocks, Culots), Conditions that govern the Intrusion of Molten Rock within the Terrestrial Crust 77