Make-a-map of the geology of the British Isles

Make-a-Map is an interactive geological map of the British Isles. It is intended for amateur geologists, students and teachers looking for an overview of the geology of the British Isles.

You can customise Make-a-Map to show just those rock units that are of interest to you. You can also show or conceal the place names, coastline and other features.

Rock types

The rocks are divided into sedimentary, metamorphic and igneous rock units.

The sedimentary and metamorphic rock units are then subdivided by their ages. In most cases this corresponds to a geological period.

See the BGS Geological Timechart for more information on the subdivisions of geological time. The igneous rocks are subdivided into intrusive and extrusive types.

Please note that Make-a-Map has been simplified and generalised to allow the whole of the British Isles to be displayed at once; for a more detailed portrayal of British geology, you can explore the Geology of Britain.

To view Make-a-Map online you will need a Flash-enabled browser. If your browser is not Flash enabled we recommend updating to the latest version. Alternatively, you can download the free plug-in Adobe Flash Player.

Want to buy a geological map of the British Isles?

Make-a-Map is based on a simplified geological map available, over-the-counter, as a postcard from BGS shops.
Poster maps showing the geology of Britain are also available from our online Bookshop or you can view maps online using our Geology of Britain viewer