RECORD: Darwin, C. R. 1857.03. [Note on denudation of the Weald]. CUL-DAR205.9.346. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2020. RN1
NOTE: Darwin made and revised estimates in chapter IX of Origin, most famously in his discussion of the denudation of the Weald.
Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR205.9 contains notes on palaeontology and geology [regarding theory of evolution].
1
North side Wealden Denudation
Chalk at North side 600 ft 600
Upper Greensand 60-80 ft 70
Gault 80 to 110 ft 90
Lower Greensand 350 ft 350 22 miles --------
1115
South side March 1857 [In] almost seen with V [illeg]
Chalk on S side 700 to 800 750
Upper Greensand 50 feet (outside) 40
Gault Greensand at 80 to 100 90
Lower Greensand probably about 200 ft 200
-------
1080
1 y [year] 1100 feet thick, & the denudation of Wealden seen not included. – It is 22 miles
From edge to edge of Wealden is & much further
East [edge to edge] & then is strips of miles or two on each side to Chalk, but we will say only 22 miles.
Miles from edge to edge of Wealden.
Land 1760 yards to north
- 22 as we suppose & [with] of cliff – 500 ft
3520 in century cliff of 1100 feet wide
3520. take 220 years
Rivers [illeg] when dry 38720
36
232320
Land 116160.
1393926 inches
220
27878400
2787840.306, 862, 400 million years times [illeg]
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022