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From Daniel Mackintosh   15 January 1880

Summary

The violent stranding of floating ice as first mentioned in CD’s article ["Ancient glaciers of Caernarvonshire", Collected papers 1: 163–71] is the most remarkable of the Moel Tryfan phenomena.

Author:  Daniel Mackintosh
Addressee:  Charles Robert Darwin
Date:  15 Jan 1880
Classmark:  DAR 171: 9
Letter no:  DCP-LETT-12426

From Daniel Mackintosh   11 November 1880

Summary

Has found three zones of stones in the Welsh and Pennine mountains which he accounts for by elevation and subsidence. Does CD think that these movements in historical times have been caused by earthquakes or by slow and gradual movements?

Author:  Daniel Mackintosh
Addressee:  Charles Robert Darwin
Date:  11 Nov 1880
Classmark:  DAR 171: 10
Letter no:  DCP-LETT-12808

To Daniel Mackintosh   13 November 1880

Summary

Comments on DM’s ["The Moel-Tryfan shelly deposits", Q. J. Geol. Soc. Lond. 37 (1881): 351–69].

Comments on cause of earthquakes.

Believes formation of ice lowered level of sea.

Author:  Charles Robert Darwin
Addressee:  Daniel Mackintosh
Date:  13 Nov 1880
Classmark:  DAR 146: 334
Letter no:  DCP-LETT-12812

From Daniel Mackintosh   21 November 1880

Summary

The use of earthquakes as a geological cause in his previous letter was careless.

Shelly beach deposits over considerable distance from Ireland to Scotland seem better explained by high sea-level than low land.

Only CD seems to have reported shattered rocks under the Moel Tryfan drift.

Author:  Daniel Mackintosh
Addressee:  Charles Robert Darwin
Date:  21 Nov 1880
Classmark:  DAR 171: 11
Letter no:  DCP-LETT-12836

To Daniel Mackintosh   21 December 1880

Summary

The recipient is thanked for his "interesting letter".

CD sends an article received from [James Geikie?]. "You will see that it is important to know whether the laminae of slate have ever been bent up-hill."

Author:  Charles Robert Darwin
Addressee:  Daniel Mackintosh
Date:  21 Dec 1880
Classmark:  Christie’s, New York (dealers) (9 June 1999)
Letter no:  DCP-LETT-12930F

From Daniel Mackintosh   24 December 1880

Summary

Thanks for the American pamphlet, which has caused him to write the enclosed extract on "bent and shattered edges of slaty laminae".

Author:  Daniel Mackintosh
Addressee:  Charles Robert Darwin
Date:  24 Dec 1880
Classmark:  DAR 171: 12
Letter no:  DCP-LETT-12936
Document type
letter (6)
Correspondent
Date
1880
01 (1)
11 (3)
12 (2)
letter