Sir Andrew Crombie Ramsay (sometimes spelt Ramsey) (31 January 18149 December 1891) was a Scottish geologist. Biography Ramsay was born at Glasgow. He was for a time actually engaged in business, but from spending his holidays in Arran he became interested in the study of the rocks of that island, and was thus led to acquire the rudiments of geology. A geological model of Arran, made by him on the scale of two inches to the mile, was exhibited at the meeting of the British Association at Glasgow in 1840, and attracted the notice of Roderick Murchison, with the result that he received, from Sir Henry De la Beche, an appointment on the Geological Survey, on which he served for forty years, from 1841 to 1881. He was first stationed at Tenby, and to that circumstance may be attributed the fact that so much of his geological work dealt with Wales. His first book, The Geology of the Isle of Arran, was published in 1841. In 1845 he became local director for Great Britain, but he continued to carry on a certain amount of field-work until 1854. To the first volume of the Memoirs of the Geological Survey (1846) he contributed a now classic essay, On the Denudation of South Wales and the Adjacent Counties of England, in which he advocated the power of the sea to form great plains of denudation, although at the time he underestimated the influence of subaerial agents in sculpturing the scenery. In 1866 he published The Geology of North Wales (vol. iii. of the Memoirs), assisted by John William Salter who contributed the palaeontological portion to this work and of which a second edition was published in 1881. He was elected as a member to the American Philosophical Society in 1862. He was chosen as a professor of geology at University College, London, in 1848, and afterwards as a lecturer in the same subject at the Royal School of Mines in 1851. Eleven years later he was elected to the presidential chair of the Geological Society of London, and in 1872 he succeeded Murchison as director-general of the Geological Survey. In 1880 he acted as president of the British Association at Swansea, and in the following year retired from the public service, receiving at the same time the honour of knighthood. In 1860 he published a book entitled The Old Glaciers of Switzerland and