Rock Types in Dartmoor – Lee Si Rong

rock_010There is a wide variety of rock types and geological formations in the British Isles. The type of underlying rock in a particular area determines the region’s physical appearance, as well as its economic activities.

Case study: granite in Dartmoor
Characteristics

Dartmoor
~Dartmoor is a National Park and is the top of an exposed batholith.
Flat-topped moorland.
~High drainage density due to impermeable nature of the granite.
Over 150 rock outcrops called tors, formed by a combination of freeze-thaw weathering and hydrolysis.
~Contains areas of standing water and peat bogs, due to the combination of high rainfall and impermeable rock.
~V-shaped river valleys formed by the numerous surface streams. Valley sides are steep due to the resistant nature of the granite.
~Contour lines are found close together on a map.
~The land is at a higher altitude than the surrounding area due to the resistant nature of the granite.
~Most of the large settlements – eg Tavistock, and Ashburton – are found near the outskirts of Dartmoor.
~The area is a popular tourist location.

Human activity in Dartmoor
An abandoned tin mine at Botallack on the West Penwith coast of Cornwall

Extraction of china clay. Kaolin, also known as china clay, is a product of hydrolysis and is used in ceramics and paper-making. The industry is very important for the local economy and employment.
Quarrying. Granite blocks were used for dry-stone walling, buildings and road stone. Many quarries are now abandoned.
Tourism. Dartmoor is a National Park, popular for walking, camping and pony trekking. Over 10 million people visit the area each year.
Farming. The soils are poor and acidic, and frequently used for sheep farming rather than growing crops.
Mining. Copper and tin mining used to be common in the area. The metals were found in thin veins within the granite.

Problems
Totnes in Devon

Quarrying, mining and china clay extraction can leave scars on the landscape, making it less attractive for both tourists and local people.
Tourism causes pollution and congestion on the roads. Tourist activities can sometimes lead to conflict with local people.
Tourists buy second homes, pushing up property prices so that locals cannot afford to buy. Rural poverty is becoming a problem in areas such as Dartmoor.

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