Between October 13 1817 and July 12 1852, Lewis Weston Dillwyn of Swansea kept a detailed diary of his life. A wealthy landowner and naturalist with an interest in geology, Dillwyn was in contact with other prominent men such as William Buckland of Oxford. In particular, entries in his diary give greater details and accurate dates of the first examinations of Paviland Cave and correctly identify other people that were involved including Mary Theresa Talbot of Penrice.