(Photo © Gigi Cohen)

Dr. Stephen R. Meyers
Associate Professor
Department of Geoscience

Ph.D., Northwestern University, 2003

Quantitative Stratigraphy, Paleoclimatology & Paleoceanography, Sedimentary Geochemistry

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My research program primarily addresses three topics: the mechanisms of climate change, the controls on the global carbon cycle, and the measurement of geologic time. These subjects are fundamentally interrelated, as there are linkages between climate and the carbon cycle, while the establishment of reliable chronologies is essential for evaluating climate forcing mechanisms and determining rates of climatic and biogeochemical change in Earth's past. My interdisciplinary approach to investigating these topics integrates data (primarily geochemical, sedimentologic and stratigraphic) with novel modeling and statistical techniques, to unravel the history of the climate system, oceans and geosphere.

While I am involved in a wide range of geoscience research, at present I am especially active in the development of quantitative approaches for the construction and evaluation of astronomical time scales, the intercalibration of astrochronologic and radioisotopic data, and the evaluation of Earth System responses to orbital-insolation changes.

astrochron: An R package for Astrochronology

The latest public beta (version 0.4.3) is available for download from CRAN.

If you use astrochron, please cite it as:
Meyers, S.R. (2014). astrochron: An R Package for Astrochronology. http://cran.r-project.org/package=astrochron

See these instructions for the installation of R and astrochron: PDF

See this graphic for a summary of the functions available in astrochron: PDF

Version 0.4.3 of astrochron is a minor upgrade.
Version 0.4.2 of astrochron includes the following improvements:

  • testPrecession - the Zeeden et al. (2015, Paleoceanography) amplitude modulation test
  • mtmML96 - a new version of the Mann and Lees (1996) robust red noise approach that solves the "edge effect" problem (see Meyers, 2012)
  • mtmAR - test your spectrum against higher order AR models (the "intermediate spectrum" test of Thomson et al. (2001))
  • integratePower - integrate evolutionary power spectra
  • taner - Taner bandpass/lowpass filter
  • surrogates - generate phase randomized surrogates as in Ebisuzaki (1997)
  • getLaskar - automatically download Laskar et al. astronomical solutions (LA04, LA10a, LA10b, LA10c, LA10d, LA11)
  • stepHeat - evaluate incremental heating Ar/Ar data
  • wtMean - evaluate total fusion Ar/Ar data
  • Code optimization throughout, to speed things up!


  • CAREER: Deciphering the Beat of a Timeless Rhythm - The Future of Astrochronology, Stephen Meyers (PI), NSF Sedimentary Geology and Paleobiology Program. (view abstract)
  • Collaborative Research: Evolution of the Climate Continuum- Late Paleogene to Present, Stephen Meyers (Lead-PI) and Linda Hinnov (Co-PI), NSF Paleo Perspectives on Climate Change (Lead program Marine Geology and Geophysics). (view abstract)
  • Collaborative Research: Integrating Radioisotopic and Astronomical Time Scales for the Cretaceous, Bradley Singer (Lead-PI), Stephen Meyers (Co-PI), and Bradley Sageman (Co-PI), NSF Sedimentary Geology and Paleobiology Program. (view abstract)


    Kristin Larkins (M.S., 2009) THESIS

    Bo He (M.S., 2010) THESIS

    Dylan Malynn (M.S., 2011) THESIS

    Wesley Ingram (Ph.D., 2013) DISSERTATION

    Miao Du (M.S., 2013)

    Wasinee Aswasereelert (Ph.D., 2014)

    Chao Ma (M.S., 2012; now a Ph.D. Candidate)

    Andrew Walters (M.S., 2013; now a Ph.D. Candidate)

    Lindsey Shanks (M.S., in progress)


    You can find an EOS article on the 2014 IsoAstro Workshop here: PDF
    The next workshop is in the planning for summer 2016.

    Page last updated November 9, 2015

    Unless otherwise noted, all content © S. Meyers