Geology
Devon's Rocks - A Geological Guide
Welcome to our guide to the rocks of Devon. This webpage contains guides to 13 different rock types found in Devon. We hope you find the information provided is appropriate for your requirement, either for leisure or study. Different levels of information is provided, which is designed for those with a general interest in rocks, along with more advanced technical descriptions.
Click on either the map or the rock name in the key below to open a PDF which contains:
- a basic description of the rock type
- a more technical explanation of the geology
- photographs of the rock type
- how the rock type has been used
- recommendations of where the rock type can be visited
Also, at the bottom of this page there are links to an ‘Introduction to the Geology of Devon’ and a document called ‘Devon's Rocks - A Geological Guide’ which is a compilation of all 13 rock type guides.
Interactive Summary Map of the Geology of Devon
Key to Devon's Principal Rock Types
Quaternary Deposits and Landforms  (315KB - pdf help) | These recent deposits are not on the map | Permian Breccias, Sandstones and Volcanics (466KB - pdf help) |  |
Tertiary Deposits (301KB - pdf help) |  | Dartmoor Granite (383KB - pdf help) |  |
Lundy Granite (202KB - pdf help) |  | Carboniferous Sandstones and Shales (431KB - pdf help) |  |
Chalk (438KB - pdf help) |  | Transition Group (Devonian to Carboniferous boundary) |  |
Upper Greensand and Gault (436KB - pdf help) |  | Devonian Slates, Sandstones and Volcanics (371KB - pdf help) |  |
Lower Jurassic Mudstones and Limestones (468KB - pdf help) |  | Devonian Limestones (309KB - pdf help) |  |
Triassic Pebble Beds, Sandstones and Mudstones (322KB - pdf help) |  | Lower Devonian Schists (397KB - pdf help) |  |
Further Information
- Introduction to the Geology of Devon (33KB - pdf help)
- Devon's Rocks - A Geological Guide (2.53MB - pdf help)
Visiting Geological Sites
- Discover Devon Geology Booklet (1.51MB - pdf help)
- Educational Register of Geological Sites
- Safety when Visiting Sites of Geological Interest (18KB - pdf help)
 | The information on this page was developed in celebration of the International Year of Planet Earth in partnership with the Devon RIGS Group. The 13 guides to the rock types were written by a team of consultants within David Roche GeoConsulting. The Basic Description sections have been subsequently edited by Devon County Council |
