Chapter V

STRATIFIED ROCKS OF MECHANICAL ORIGIN--THEORY DEVELOPED
AND ILLUSTRATED.

Formation of Stratified Rocks ascribed to the Agency of Natural
Causes--This Theory supported by Facts--The Argument
stated--Examples of Mechanical Rocks--Materials of which
they are composed--Origin and History of these Materials
traced out--Process of Deposition--Process of Consolidation
--Instances of Consolidation by Pressure--Consolidation perfected
by Natural Cements--Curious Illustrations--Consolidation of
Sandstone in Cornwall--Arrangement of Strata explained by
intermittent Action of the Agents of Denudation, 87