Asks for the reference in which JP states that some erratic boulders came from a lower to a higher level. CD is writing a paper ["Transportal of erratic boulders", Collected papers 1: 218–26] in which he believes he has the true explanation. Would like as many instances, with details, as possible.
Down Farnborough Kent
My dear Sir
I hope that you will excuse my giving you a little trouble. In M
Since you wrote your account (in whichever work it may be inserted) of the boulders so
situated in Yorkshire, have you made any further observations on this head, & in
that case would you kindly communicate with me. Is the difference of level accurately or
only approximately ascertained? M
Do you know of any other published cases?
I feel sure that your kindness will lead you to forgive this trouble.
Pray believe me, my dear Sir | Yours very sincerely | C. Darwin
P.S. I am employed in drawing up some Geological instructions, at the desire
of Sir J. Herschel for the Admiralty Volume. Do you happen to have any
suggestions, or special points of enquiry, likely to suit Naval Expeditions; I
- f1 1157.f1Dated from the reference to CD's chapter on geology, which he had undertaken to write for the Admiralty manual (Herschel ed. 1849). See letter to J. F. W. Herschel, 4 February 1848.
- f2 1157.f2Hopkins 1848, pp. 96, 98.
- f3 1157.f3Phillips 1835 and 1837–9, 1: 270.
- f4 1157.f4CD's paper, ‘On the transportal of erratic boulders from a lower to a higher level’ (Collected papers 1: 218–27), was read at the Geological Society on 19 April 1848. His hypothesis was that the erratic boulders were transported by coast-ice as the land was subsiding. The boulders that were pushed inshore would, at the end of the period of subsidence, be deposited at a level higher than the parent rock.
- f5 1157.f5Milne 1847a, p. 167.
- f6 1157.f6Hitchcock 1841, 1: 5a.
- f7 1157.f7In his paper, ‘On the transportal of erratic boulders’ (Collected papers 1: 218–27), CD was anxious to discount explanations based on great floods or debacles in favour of transportal by floating ice (p. 225). Boulders in Glen Roy were described in ‘On the parallel roads of Glen Roy’, Collected papers 1: 118–22.