Whitbread, K., Ellen, R., Callaghan, E., Gordon, J. E. and Arkley, S. 2015. East Lothian Geodiversity Audit. British Geological Survey Open Report, OR/14/063. 192pp.
Appendix 3 Chemical classification and nomenclature of fine-grained crystalline rocks
Total alkali silica (TAS) diagram (sourced from BGS Rock Classification Scheme, Volume 1, Classification of igneous rocks). The scheme names igneous crystalline rocks based on their silica to sodium/potassium content.