Bovey Tracey (/ˌbʌvi ˈtreɪsi/) is a town and civil parish in Devon, England. It is located on the edge of Dartmoor, which gives rise to the slogan used on the town's boundary signs: The Gateway to the Moor. It is often known locally as Bovey. About 10 miles (16 km) south-west of Exeter, it lies on the A382 road, about halfway between Newton Abbot and Moretonhampstead. The village is at the centre of the electoral ward of Bovey. At the 2021 census, it had a population of 7,996, which was an increase on the 7,168 recorded in the 2011 census.
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Bovey Tracey in the context of Tonstein
Tonstein (from the German "Ton", meaning clay, plus "Stein", meaning stone) is a hard, compact sedimentary rock that is composed mainly of kaolinite or, less commonly, other clay minerals such as montmorillonite and illite. The clays often are cemented by iron oxide minerals, carbonaceous matter, or chlorite. Tonsteins form from volcanic ash deposited in swamps.Tonsteins occur as distinctive, thin, and laterally extensive layers in coal seams throughout the world. They are often used as key beds to correlate the strata in which they are found. The regional persistence of tonsteins and relict phenocrysts indicate that they formed as the result of the diagenetic alteration of volcanic ash falls in an acidic (low pH) and low-salinity environment, consistent with a freshwater swamp. In contrast, the alteration of a volcanic ashfall deposit in a marine environment typically produces a bentonite layer.
The induration of tonsteins is in contrast to kaolin claystones that can be mined for kaolin clay, such as the ball clays found at Bovey Tracey which formed by the erosion of a nearby kaolinised granite. These deposits are generally softer, white, and plastic.