Letter to Sir Charles Lyell from William Blackadder on geological matters. He mentions some post diluvium conglomerate found at Glamis gate, discusses the route of the river Nith from its source in the coalfields of Ayrshire to the Solway Firth and remarks that he considers the sweep of diluvium hillocks near Melgund Castle to be the most extraordinary in the country, 15 October 1827.

Document entitled Trap Conglomerate discussing the geological history of Strathmore and the formation of the rocks in the area, c1822-1824. Written on the back of a piece of text entitled Asia which relates to the geology of the Steppe area of Russia between the Caspian and Black Seas.