College of Earth, Ocean, and Atmospheric Sciences

  • About
  • Academics
  • Research
  • Analytical Facilities
  • Ships
  • Directory
  • Students
  • Faculty & Staff
  • Alumni & Friends
  • Directory of People

    G. Brent Dalrymple

    G. Brent Dalrymple photo
    Professor Emeritus
    Discipline: Geology and Geophysics
    Phone: 541-754-9170
    Fax: 541-754-9170
    Email: brentandsharon@comcast.net

    Research Interests

    Radiometric dating methods, esp. 40Ar/39Ar techniques
    Geomagnetic field behavior, esp. Polarity reversals
    History and timing of volcanic events
    Impact history on the early Moon
    Age of the Earth


    A.B., Geology, Occidental College, 1959
    Ph.D., Geology, University of California, Berkeley, 1963

    Academic Honors

    Fellow, American Geophysical Union, 1975
    American Academy of Arts & Sciences, 1992
    Honorary D.Sc., Occidental College, 1993
    National Academy of Sciences, 1993
    Public Service Award, Geological Society of America, 2001
    National Medal of Science, 2003


    Dalrymple, G. B., 1991, The Age of the Earth: Stanford University Press, 474 pp..

    Dalrymple, G.B., and Ryder, G., 1996, Argon-40/Argon-39 age spectra of Apollo 17 highlands breccia samples by laser step-heating and the age of the Serenitatis Basin: Journal of Geophysical Research (Planets), vol. 101, p. 26,069-26,084..

    Wolfe, E.W., Wise, W.S., and Dalrymple, G.B., 1997, The geology and petrology of Mauna Kea Volcano, Hawaii--A study of postshield volcanism: U.S.G.S. Prof. Paper 1557, 129 pp + maps..

    Izett, G.A., Cobbin, W.A., Dalrymple, G.B., and Obradovich, J.D., 1998, 40Ar/39Ar age of the Manson Impact Structure, Iowa, and correlative impact ejecta in the Crow Creek Member of the Pierre Shale (Upper Cretaceous), South Dakota and Nebraska: Geol. Soc. American Bulletin, vol. 110, p. 361-376..

    Dalrymple, G.B., and Hamblin, W.K., 1998, K-Ar ages of Pleistocene lava dams in the Grand Canyon in Arizona: Proceedings of the National Academy of Sciences, vol. 95, p. 9744-9749..

    Dalrymple, G.B., Grove, M., Lovera, O.M., Harrison, T.M., Hulen, J.B., and Lanphere, M.A., 1999, Age and thermal history of the Geysers plutonic complex (Felsite unit), Geysers geothermal field, California: a 40Ar/39Ar and U-Pb study: Earth Planet. Sci. Lett. vol. 173, P. 285-298..

    Dalrymple, G.B., 2001, The age of Earth in the twentieth century: A problem (mostly) solved. pp. 205-221 in Lewis, C.L.E., and Knell, S.J. (eds), The Age of the Earth: from 4004 BC to AD 2002. Geological Society of London Special Publication 190..

    Davis, A.S., Clague, D.A., Bohrson, W.A., Dalrymple, G.B., and Greene, H.G., 2002, Seamounts at the Continental Margin of California: A different kind of oceanic intra-plate volcanism: Geol. Soc. Amer. Bull, vol. 114, p. 316-333..

    Dalrymple, G.B., 2004, Ancient Earth, Ancient Skies: Stanford University Press, 247 p.

    Dalrymple, G.B., 2007, The ages of the Earth, Solar System, Galaxy, and Universe. Pp. 150-179 in Peto, A.J., and Godfrey, L.R., eds., Scientists Confront Intelligent Design and Creationism: W.W. Norton, 463 pp.