page_title: List of geologists
section_title: J
hierarchical_section_title: List of geologists / J
caption_attribution_description: Deutsch: David A. Johnston, aufgenommen von Harry Glicken am 17. Mai 1980, 13 1/2 Stunden vor dem Ausbruch des Mount St. Helens English: Photo of David A. Johnston, taken by Harry Glicken on May 17, 1980 at 19:00, 13 1/2 hours before the 1980 eruption of Mount St. Helens Svenska: Foto av David A. Johnston taget av Harry Glicken den 17 maj 1980, 13,5 timme före Mount Saint Helens utbrott.
context_page_description: A geologist is a contributor to the science of geology. Geologists are also known as earth scientists or geoscientists.
  The following is a list of notable geologists. Many have received such awards as the Penrose Medal or the Wollaston Medal, or have been inducted into the National Academy of Sciences or the Royal Society.
  Geoscience specialties represented include geochemistry, geophysics, structural geology, tectonics, geomorphology, glaciology, hydrology, hydrogeology, oceanography, mineralogy, petrology, crystallography, paleontology, paleobotany, paleoclimatology, palynology, petroleum geology, planetary geology, sedimentology, soil science, stratigraphy, and volcanology. In this list, the person listed is a geologist unless another specialty is noted. Only geologists with biographical articles in Wikipedia are listed here.
context_section_description: Thomas Jaggar (1871–1953), American, volcanologist and founder of the Hawaiian Volcano Observatory
  James A. Jensen (1911–1998), American, distinguished dinosaur paleontologist and sculptor
  Dougal Jerram (born 1969), British geologist/earth scientist, television and media presenter and author
  David A. Johnston (1949–1980), American, volcanologist, killed in the 1980 eruption of Mount St. Helens
  Franc Joubin (1911–1997), Canadian (born United States), discovered Elliot Lake uranium district
  John Wesley Judd (1840–1916), British geologist, professor at the Royal School of Mines, London
caption: David A. Johnston at Mount St. Helens, 5-17-1980
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