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To Charles Lyell   5 March [1869]

Summary

Discusses wear and tear due to glaciation and significance of this evidence for dating the glacial period. Mentions views of James Croll and Archibald Geikie on the issue.

Author:  Charles Robert Darwin
Addressee:  Charles Lyell, 1st baronet
Date:  5 Mar [1869]
Classmark:  American Philosophical Society (Mss.B.D25.364)
Letter no:  DCP-LETT-6692