The Ancient Volcanoes of Great Britain, Volume 1 (of 2)
CHAPTER III
Ancient Volcanoes: Proofs of their existence derived from the Nature of the Rocks erupted from the Earth's Interior. A. Materials erupted at the Surface--Extrusive Series. i. Lavas, their General Characters. Volcanic Cycles. ii. Agglomerates, Breccias and Tuffs 14