From:
Charles Robert Darwin
To:
John Phillips
Date:
18 Jan [1856]
Source of text:
American Philosophical Society (Mss.B.D25.122)
Summary:
Discusses chapter [6] on cleavage and foliation in South America. Notes especially cleavage where two series cross and cleavage as basis of foliation in metamorphosed rock. Notes foliation in rocks that have been liquefied by heat. Mentions case described in his "Geology of the Falkland Islands" [Collected papers 1: 203–12]. Discusses relationship of cleavage to beds. Speculations on association between grauwacke and clay-slates.
Contributor:
Darwin Correspondence Project