previous index next
LA1001: View eastwards from the Lawley, Shropshire. Composed of ancient Precambrian volcanic rocks the Lawley has to the east the oldest Cambrian rocks in Britain, the Lower Comley sandstones. These are greenish micaceous sandstones, the green colour produced by the mineral glauconite which is indicative of marine conditions..There seems to have been a world wide marine transgression in the early Cambrian, maybe with a sea-level rise as much as 200-300 m.

 Micromacro home published work email Sinclair Stammers crystals fossils micro-organisms science natural history landscapes people