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1860-1869::1861 in date 
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DCP-LETT-3270

From:
Charles Lyell, 1st baronet
To:
Charles Robert Darwin
Date:
30 Sept 1861
Source of text:
The University of Edinburgh Centre for Research Collections (Gen.112/2813-16)
Summary:

Asks for copy of CD’s paper ["Ancient glaciers of Caernarvonshire", Collected papers 1: 163–71]. Gathers that drift of Moel Tryfan is glacial.

Believes Glen Roy roads formed later than submergence of Scotland.

Asks CD’s opinion concerning relative chronology of various glacial deposits, particularly a flint tool find in the Ouse River near Bedford.

Contributor:
Darwin Correspondence Project

DCP-LETT-3294F

From:
Charles Lyell, 1st baronet
To:
Charles Robert Darwin
Date:
22 Oct 1861
Source of text:
Natural History Museum, Library and Archives (General Special Collections DC AL 7/1)
Summary:

Ice could not have formed the blockages in Lochaber unless in every case the water escaped over some col into a contiguous valley on the same watershed, or into the eastern watershed. Supposes that the cols were not land-straits, but the places where the lakes were drained when forced to flow the wrong way.

Contributor:
Darwin Correspondence Project
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