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DCP-LETT-1626

From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
10 Jan [1855]
Source of text:
American Philosophical Society (Mss.B.D25.110)
Summary:

Discusses views of Daniel Sharpe on foliation and cleavage. Recalls his own previous discussion [in South America].

Contributor:
Darwin Correspondence Project

DCP-LETT-1630

From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
14 Jan [1855]
Source of text:
American Philosophical Society (Mss.B.D25.111)
Summary:

Has found a house on Baker Street to take for a month.

Mentions Daniel Sharpe’s study of the Grampians.

Association of various metamorphic rocks and relationship of their foliation to their dip and strike. Discusses foliation of schists and its origin. Comments on fluidity of gneiss and schists.

Contributor:
Darwin Correspondence Project

DCP-LETT-1633

From:
Charles Robert Darwin
To:
Charles Lyell, 1st baronet
Date:
[21 Jan – 11 Feb 1855]
Source of text:
American Philosophical Society (Mss.B.D25.112)
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.

Contributor:
Darwin Correspondence Project
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