"On the Distribution of Erratic Boulders..." by C. Darwin

The papers submitted by C. Darwin to the Geological Society are available online Darwin´s Papers:

C. Darwin
'On the Transportal of Erratic Boulders from a lower to a higher level'
Quarterly Journal of the Geological Society 4: 315-323.
http://jgslegacy.lyellcollection.org/cgi/reprint/4/1-2/315

C. Darwin
'XXVII.—On the Distribution of the Erratic Boulders and on the Contemporaneous Unstratified Deposits of South America'
Transactions of the Geological Society of London s2-6: 415-431.
http://trn.lyellcollection.org/cgi/reprint/s2-6/2/415