The Silurian System, Founded on Geological Researches, 1839
'Panoramic of the hills south west of Llanwrtid Brecknockshire'
Hand-coloured lithograph by Day and Haghe from a drawing by Mrs. Traherne.
This is Darwin's own copy of the work.
Murchison was, with Lyell, one of the most influential geologists of the 1830s. He was convinced that embedded fossils, rather than mineral types, were the best guide to understanding the relative ages of rock strata.
Darwin Papers, Cambridge University Library
A Voyage Round the World: Charles Darwin and the Beagle Collections, Cambridge University Library