iGeology and William Smith

The recently released version 2 of iGeology includes a reproduction of the William Smith 1815 map. There is a 'fade-in' slider that allows you to change the transparency so you can compare William Smith's map with the BGS map. There is a brief biography of W. Smith and some other new features. These include improved descriptions of the units which include an indication of geological age (in million years) and period and the prevailing environment (which is based the Climate Through Time poster, though it doesn't actually say so in the app).