A Finnish petrologist known for an early estimate of the Earth's age
Jakob Sederholm
Jakob Sederholm
Born
20 July 1863
Helsinki, Finland
Died
26 June 1934 (1934-06-27) (aged 70)
Nationality
Finnish
Known for
Jotnian, Migmatite, Myrmekite, Rapakivi granite
Awards
Murchison Medal (1928) Penrose Medal (1928)
Scientific career
Fields
petrologist
Institutions
Geological Survey of Finland
Signature
Jakob Johannes Sederholm (20 July 1863 – 26 June 1934)[1] was a Finnish petrologist most associated with his studies of migmatites.[2]
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[3]), 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. From 1921 to 1923, he led the League of Nations' "Commission of Enquiry in Albania" in the Principality of Albania.[4] 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.[5]
^mindat.org
^Hancock, Paul L.; Skinner, Brian J.; Dineley, David L. (2000). The Oxford Companion to The Earth. Oxford University Press. ISBN 0-19-854039-6.
^Haapala, I. (2005). "Chapter 17: History of Finnish bedrock research". In Lehtinen, Martti; Nurmi, Pekka A.; Rämö, Tapani (eds.). Precambrian Geology of Finland. Amsterdam: Elsevier. pp. 683–701. ISBN 9780080457598.
^Autio, Veli-Matti (9 October 2006). "Jakob Johannes Sederholm". Biografiasampo [fi] (in Finnish). Retrieved 20 December 2023.
^Michener, James (1974). Centennial. Random House. ISBN 0-394-47970-X.
Jakob Johannes Sederholm (20 July 1863 – 26 June 1934) was a Finnish petrologist most associated with his studies of migmatites. Troubled by illness throughout...
Sederholm is a surname. Notable people with the surname include: Emelie Sederholm (born 1994), Finnish singer-songwriter JakobSederholm (1863–1934), Finnish...
granulite are roughly equivalent mafic rocks. The Finnish petrologist JakobSederholm first used the term in 1907 for rocks within the Scandinavian craton...
easily into sand. Rapakivi was first described by Finnish petrologist JakobSederholm in 1891. Since then, southern Finland's rapakivi granite intrusions...
and teacher Agnes Tschetschulin (1859–1942), composer and violinist JakobSederholm (1863–1934), petrologist Karl Fazer (1866–1932), baker, confectioner...
Postjotnian (1909). Ramsay also coined the term ijolite. Together with JakobSederholm, Ramsay was a student of Fredrik Johan Wiik. Pentti Eskola was a student...
the Ancient Greek μὑρμηχἰα (wart) or μὑρμηξ (ant) and was used by JakobSederholm in 1899 for the first time to describe these structures. During K-metasomatism...
Imperial Alexander University of Finland, where his students included JakobSederholm and Wilhelm Ramsay. He was also the first scientist in Finland to use...
the Northwest Territories, and the iron deposits of Labrador. With JakobSederholm in 1930, he investigated Finland's Precambrian geology. Bruce did geological...
"Jotnian" comes the Old Norse word "Jötunn" roughly meaning "giant". JakobSederholm was the first to differentiate the rocks and use the term "Jotnian"...
Eckermann Antoine Lacroix Akiho Miyashiro Paul Niggli Hans Ramberg JakobSederholm Albert Streckeisen Marjorie Wilson Peter John Wyllie Lawrence Wager...
2022: Full List of Nominations". Variety. Retrieved 26 January 2022. Sederholm, Jillian (5 December 2023). "2024 Film Independent Spirit Awards nominations:...
Alexander Miers (1858–1942), Leonard James Spencer (1870–1959), Jakob Johannes Sederholm (1863–1934) 1931 Gottlob Linck (1858–1947), Reinhard Brauns (1861–1937)...
Helsinki 1858. Teckningar och drömmar. Theodor Sederholm, Helsinki 1861. Sigrid Liljeholm. Theodor Sederholm, Helsinki 1862. Anteckningar om Runeberg. Min...
1930 François Alfred Antoine Lacroix 1929 No award given 1928 Jakob Johannes Sederholm 1927 Thomas Chrowder Chamberlin Source: GSA Category:Penrose Medal...
from 1934 to 1935 at the University of Uppsala. There he also met Jakob Johannes Sederholm, Caesar Eugen Wegmann (1896–1982), Pentti Eskola, and Thomas "Tom"...
Stigzelius 1970–1980 Vladi Marmo 1960–1969 Aarne Laitakari 1935–1960 Jakob Johannes Sederholm, 1893-1933 K. A. Moberg 1886-1893 The agency has 6 offices in the...
Laurell (1801–1852) Karl Sederholm (1789–1867) Johan Vilhelm Snellman (1806–1881) Johann Mathias Sundvall (1793–1843) Johan Jakob Tengström (1787–1858) Other...
Thomas 1926 William Savage Boulton 1927 George Thurland Prior 1928 Jakob Johannes Sederholm 1929 Charles Alfred Matley 1930 Arthur Lewis Hall 1931 George Walter...
m (+1.8 m/s) 6 August 1999 Byrkjelo, Norway Shot put 17.11 m Katarina Sederholm 4 July 1998 Hämeenkyrö, Finland Discus throw 69.68 m Mette Bergmann 27...
Kalmar County Southern Edward Sederholm independent Protectionist Party 1883–1902 Södermanland County Gustaf Sederholm National Party National Organization...
Global Information
