July 2016 GSA Today Cover (IMAGE) Geological Society of America Caption Digital reconstructions of maps of the English county of Somerset used by William Smith in his geologic mapping. (A) Smith's first geological map around the city of Bath on a base map made by Taylor and Meyler (1799). (B) Part of the Day and Masters (1782) map of Somerset known to have been used by Smith. (C) Smith's geological map of Somerset based on his engraved geological lines on a map by John Cary. All maps have been re-projected and overlain on part of Smith's 1815 geological map of England and Wales. Credit GSA Today; courtesy Peter Wigley and the Geological Society, London. Usage Restrictions Credit: GSA Today; courtesy Peter Wigley and the Geological Society, London. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.