Geological Map

Glacial Sediments
Scarlett volcanics
Castletown limestone
Peel sandstone
Poortown Gabbro
Dalby Group

Click here for rock types within the Manx Group

Click here for 3D view of the Isle of Man

This is a representation of the rock types that occur at or near the surface on the Isle of Man. Most of the rocks are in fact covered by a thin layer of soil so that the map is an interpretation – the geology is extrapolated from areas where the rocks are exposed such as at the coast or in quarries. A large part of the Island is composed of a suite of rocks collectively known as the Manx Group. These were originally sediments deposited on the sea bed 490-470 million years ago.

See also Manx Group Fossils and Lamplugh’s Geology