Britain lay south of the equator and had a semi-arid climate. Marine limestones, sandstone and mudstones were developed in the south west. Elsewhere sandstones were deposited by rivers on the coastal plain (known as the Old Red Sandstone). Fossils include fish and the first higher plants.
*Based on The Geologic Time Scale 2012 by F M Gradstein, J G Ogg, M Schmitz and G Ogg (2012), with additions.