Area: 0.5 hectares.
Description and Reasons for Notification:
This site features rare exposures of the contact between the Permo-Carboniferous Dartmoor granite and Devonian country rocks of the Kate Brook Formation. The contact is highly irregular, though sharp, and shows evidence of mobilisation of the metasediments and segregation of felsic and mafic constituents. Along the contact the country rocks have been thermally metamorphosed to form cordierite-andalusite hornfelses with extensive tourmalinisation. The site has been the subject of classic and pioneering studies investigating compositional exchanges between granite magma and country rocks, and is of historical importance in understanding the genesis of granitic rocks.