Dartmoor Tors | Granite Tors of Dartmoor National Park

 
 
 
 

Moor Tors - Dartmoor Tors | Granite Tors of Dartmoor National Park

Dartmoor Tors are composed usually of granite or metamorphic rocks. Tors can also be found around any previously erupted volcanoes (although Devonian and Carboniferous outcrops are also found), though occasionally of other hard rocks such as quartzite, and are the result of millions of years of weathering. In prehistoric times, when the land was covered in forest, rain water seeped into the ground and gradually weathered the bedrock through its natural cracks, or joints. Once the land became exposed, the weathering was accelerated, particularly during the Ice age when freezing water expanded in the cracks. The result can be seen today in dramatic rock formations.

Some of the more durable granite survived to form the rocky crowns of Dartmoor Tors. One of the best known is at Haytor, on the eastern part of the moor, whose granite is of unusually fine quality and was quarried during the 19th and early 20th centuries. Its stone was used to construct the pillars outside the British Museum in London, and to build London Bridge (now in Arizona). The last granite to be quarried there was used to build Exeter War Memorial in 1919.

 
 
 

Click a pointer on the Map to view more information and Virtual Tour