RECORD: Darwin, C. R. n.d. Abstract of John Ball, Remarks upon the Geology, and physical features of the country west of the Rocky Mountains, 1835. CUL-DAR5.B75-B76. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2021. RN2
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.
Related abstract in CUL-DAR5.B83: Sillimans J. vol. 28 p. 3 Mr Ball on the Geology of the Rocky mountains. The division of the waters in Lat. above 40 near the sources of Lewis river seems formed by a plain nearly ten thousand ft high covered with boulders of granite.
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* (2) (Footnote to p. 37.) Mr Ball (Silliman's American Journal vol. 28. p. 3) mentions a most extraordinary fact, that near the sources of the
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(2)
Lewis River, a great plain nearly 10,000 feet high, which forms the watershed of the continent in about Lat. 40°; is covered with boulders of granite. If the dispersal of boulders has taken place at about the same period, through the agency of floating ice, in the temperate regions of both hemispheres, this fact shows what prodigious changes in physical geography have taken place within a very modern geological period.
Such changes are probably intimately connected with that state of climate which favoured the contemporaneous action of ice in low-latitudes in both hemispheres.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 2 December, 2022