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The correpondence relating to Sir Roderick Impey Murchison's dispute with Adam Sedgwick about Silurian classification consists of:

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Notes for 4 lectures on the 'Volcanic History of Britain', given to the Royal Institution in 1886. Sir Archibald Geikie looked at the emergence of types of geological formations against a geological timeframe and how they have been affected by various processes, especially the action of volcanoes and materials produced by them, within the natural world. He used examples from numerous locations from different parts of the British Isles.

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Letter to Sir Andrew Crombie Ramsay from Hugh Edwin Strickland asking for corrections to the thicknesses of the Cambrian series for a vertical section of the series of British strata which he was preparing for a lecture at Oxford.

Scope and Contents Letter to Sir Archibald Geikie from Capt Clarence Edward Dutton discussing the fossiliferous Upper Cambrian metamorphosed sandstone shales found at Lake Superior and the Grand Canyon. At Lake Superior these beds overlie 1400 feet of unfossiliferous sandstone and shale, interspersed with layers of copper bearing metamorphosed volcanic ash. These are the same as the Huronian metamorphic beds at Lake Huron which are possibly of the Lower Cambrian age due to an unconformity (as identified by...

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Letter to Sir Archibald Geikie from T Belt enclosing a reprint of his paper on the Lingula Flags of Wales in which he believes he was the first to suggest that the Menevian Group beds identified by John William Salter and H Hicks form the natural boundary of the Cambrian rocks.

Scope and Contents This dark red Notebook starts in London with Mary and Leonard Lyell, and documents travels in Pembrokeshire, Wales, with an index created by Arabella Buckley. Lyell studies submerged forests, beaches, caves and iron works making notes and sketches, and referencing experts as well as local guides. Several meetings 'with Darwin'. Final pages relate to Grindle Pit, Bury St Edmunds, with sections written by Buckley that appear to be dictated by Lyell. ...

Scope and Contents This dark red Notebook is annotated with Lyell's name, address at 73 Harley Street, London. The Notebook documents work based along the coast of Norfolk, as Lyell travels with Mary [presumed as she is not mentioned], Buckley and his nephew Leonard Lyell - who is credited with observations and finds. From Norfolk, they head to Hull and Withernsea. In this Notebook, not every page is numbered. This Notebook contains sections where Buckley describes their field work, recording observations like...

Scope and Contents Notes for 6 lectures on 'Geographical Evolution', encompasing a wide variety of related subjects. Sir Archibald Geike looked at various geological periods and how both the areas occupied by land and water changed over time. He looked at the creation of many geological formations, at the materials they were composed of and the processes involved, including the infleunce of different elements within the natural world. He used as examples numerous locations, mostly within the British Isles but...