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To Charles Lyell   [21 January – 11 February 1855]

Summary

Relationship of schists to alternating beds of slate in western Tierra del Fuego and the Chonos Islands.

Comments on Sharpe’s theory of curved cleavage planes.

Example of metamorphosis in a "clay-slate porphyry region". Importance of previous lines of cleavage and stratification in foliation of metamorphosed rock.

Author:  Charles Robert Darwin
Addressee:  Charles Lyell, 1st baronet
Date:  [21 Jan – 11 Feb 1855]
Classmark:  American Philosophical Society (Mss.B.D25.112)
Letter no:  DCP-LETT-1633
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