| Administrative History | Item may be by Robert Dadd, father of the artist Richard Dadd, who was a known lecturer on geology. Dadd senior was murdered by his son in 1843, and Richard spent his remaining years in Bethlem and Broadmoor asylums. |
| Publication Note | From a communication read before the Society, 15 May 1833, and published as: Dadd, R. "A Memoir on the Valley of the River Medway", 'Proceedings of the Geological Society of London', vol 1 (1833), pp482-483. Section not published. |