Francis John Turner
Francis John Turner (10 April 1904 – 21 December 1985) was a New Zealand geologist.His application and expansion of Pentti Eskola's concept of metamorphic facies led to his publication of Mineralogical and Structural Evolution of Metamorphic Rocks, the book that established his position in the field of petrology and was a great influence on a generation of geologists.At Berkeley he gained insight into experimental studies of petrology and geochemistry.He later collaborated with John Verhoogen on the classic work Igneous and Metamorphic Petrology published in 1960.He authored eighty technical papers and six textbooks on metamorphic, igneous, and structural petrology.