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To John Phillips 18 January [1856]
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.
| Author: | Charles Robert Darwin |
| Addressee: | John Phillips |
| Date: | 18 Jan [1856] |
| Classmark: | American Philosophical Society (Mss.B.D25.122) |
| Letter no: | DCP-LETT-1822 |
Author
| Darwin, C. R. | (1) |
Addressee
| Phillips, John | (1) |
