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- Jakob_Sederholm abstract "Jakob Johannes Sederholm (20 July 1863 – 26 June 1934) was a Finnish petrologist most associated with his studies of migmatites.Troubled by illness throughout his life, Sederholm originally chose to study geology to allow him to work outdoors. After studying first in Helsinki (where he was a student of Fredrik Johan Wiik), then in Stockholm and Heidelberg, Sederholm returned to Finland to work for the Geological Survey of Finland. In 1893 he assumed the role of director of this institution, a post he occupied until his death forty years later.Working on local Precambrian basement rocks, Sederholm instigated a map-making programme that, between 1899 and 1925, published many maps and descriptions of their geological history. Gneisses in the areas he studied (the so-called Baltic Shield) were often of mixed composition, with layers of granitic rock being interleaved with metamorphic rock. Sederholm termed these as migmatites, and viewed them as the product of the intrusion of igneous magma into metamorphic rocks at depth.During his career Sederholm received both the Murchison Medal from the Geological Society of London (1928) and the Penrose Medal from the Geological Society of America (also 1928). The mineral sederholmite is named in his honour.Aside from his geological work, Sederholm was a member of the Diet of Finland, and undertook missions from this to the League of Nations. He was also a member and chairman (twice) of the Economic Society of Finland.In the 1974 historical novel Centennial, James Michener listed Sederholm among those scientists who made early estimates of the age of the Earth. Sederholm's estimate was 40 million years.".
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- Jakob_Sederholm award Murchison_Medal.
- Jakob_Sederholm birthDate "1863".
- Jakob_Sederholm birthPlace Helsinki.
- Jakob_Sederholm birthYear "1863".
- Jakob_Sederholm deathDate "1934".
- Jakob_Sederholm deathDate "1934-06-26".
- Jakob_Sederholm deathYear "1934".
- Jakob_Sederholm field Petrology.
- Jakob_Sederholm nationality Finland.
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- Jakob_Sederholm wikiPageExternalLink Jakob-Johannes-Sederholm.
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- Jakob_Sederholm wikiPageExternalLink Sederholmite.shtml.
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- Jakob_Sederholm birthDate "--07-20".
- Jakob_Sederholm birthPlace Helsinki.
- Jakob_Sederholm caption "Jakob Sederholm".
- Jakob_Sederholm dateOfBirth "1863".
- Jakob_Sederholm dateOfDeath "1934".
- Jakob_Sederholm deathDate "1934-06-26".
- Jakob_Sederholm field Petrology.
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- Jakob_Sederholm name "Jakob Sederholm".
- Jakob_Sederholm name "Sederholm, Jakob".
- Jakob_Sederholm nationality Finland.
- Jakob_Sederholm prizes Murchison_Medal.
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- Jakob_Sederholm shortDescription "Finnish geologist".
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- Jakob_Sederholm description "Finnish geologist".
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- Jakob_Sederholm subject Category:Finnish_geologists.
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- Jakob_Sederholm comment "Jakob Johannes Sederholm (20 July 1863 – 26 June 1934) was a Finnish petrologist most associated with his studies of migmatites.Troubled by illness throughout his life, Sederholm originally chose to study geology to allow him to work outdoors. After studying first in Helsinki (where he was a student of Fredrik Johan Wiik), then in Stockholm and Heidelberg, Sederholm returned to Finland to work for the Geological Survey of Finland.".
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- Jakob_Sederholm givenName "Jakob".
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- Jakob_Sederholm name "Jakob Sederholm".
- Jakob_Sederholm name "Sederholm, Jakob".
- Jakob_Sederholm surname "Sederholm".