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To J. S. Henslow   18 April 1835

Summary

Has just returned from crossing the Cordilleras. Geological observations of formations representing great epochs of violence which broke up the earth’s crust. Shells at over 12000 feet. Silicified trees in sandstone formations at great heights. Red snow and viviparous lizards. Botanical specimens.

Author:  Charles Robert Darwin
Addressee:  John Stevens Henslow
Date:  18 Apr 1835
Classmark:  Royal Botanic Gardens, Kew (Henslow letters: 26 DAR/1/1/26)
Letter no:  DCP-LETT-274

To Susan Darwin   23 April 1835

Summary

His trip across the Andes and back was his most successful excursion: can clearly demonstate that the western part of the double line of mountains is much older, with fossil shells at 12000ft; the eastern line may be as modern as the Patagonian plains. If proved, this is an important fact in the theory of the formation of the world. Has found petrified trees.

Author:  Charles Robert Darwin
Addressee:  Susan Elizabeth Darwin
Date:  23 Apr 1835
Classmark:  DAR 223
Letter no:  DCP-LETT-275
Document type
letter (2)
Author
Addressee
Correspondent
Date
1835
04
18 (1)
23 (1)
letter