Sir Roderick Impey Murchison (1792 1871) was an influential Scottish geologist best known for his classification of Palaeozoic rocks into the Silurian system. After early military experience in the Peninsular War, he resigned his commission; a chance meeting with Sir Humphrey Davy led him subsequently to pursue a scientific career. The Silurian System, published in 1839, was a highly influential study, which established the oldest contemporary classification of fossil-bearing strata. Murchison was appointed President of the Royal Geographical Society in 1843. These volumes, first published in...

Sir Andrew Crombie Ramsay (1814 91) was a British geologist with a particular interest in the effects of glaciation on the landscape. He travelled in Europe and America, and was a keen climber. His first work, Geology of the Island of Arran (1840), also published in this series, attracted the attention of Roderick Murchison, who found him employment with the Geological Survey, and Ramsay later succeeded Murchison as its director. He carried out important fieldwork in Wales, taught at University College London and the Royal School of Mines, and published a successful textbook. Another major...