| Description | Murchison correspondence: letter from Robert HARKNESS, Dumfries, 4 Nov 1850. Re: Sending Murchison a selection of the different species of graptolites found in Dumfriesshire, describes briefly his most recent papers ["On the Silurian Rocks of Dumfriesshire and Kirkcudbrightshire" & "Description of the Graptolites found in the Black Shales of Dumfriesshire", published in 'Quarterly Journal of the Geological Society', vol 7 (1851), pp46-58 & 58-64.], detailed description of what he believes to be Silurian geology in the local area. |