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Our Mission


The mission of the division is to bring together scientists interested in geochronology, to provide a suitable forum for presentation and discussion of problems and opportunities in geochronology, to stimulate research and teaching in geochronology, and to act as an organized group in promoting these objectives within the framework of the Geological Society of America.

Welcome to the Geochronology Division!


Our community spans a wide range of geoscientists with interests and expertise in the measurement of geologic time, laboratory method development, and diverse applications to understanding Earth Processes. 

Zircon Madness 2026 Winners

Thanks to everyone who participated in Zircon Madness! Congratulations to our winning zircon crystal from Ireland & Williams (2003), with second place going to Liati & Gebauer (2003), and 3rd place to Mixon et al. (2023). You can read more about their work in the following articles. 

  • Trevor R. Ireland, Ian S. Williams; Considerations in Zircon Geochronology by SIMS. Reviews in Mineralogyand Geochemistry 2003;; 53 (1): 215–241.doi: https://doi.org/10.2113/0530215
  • Liati and Gebauer, Geochronological constraints for the time of metamorphism in the Gruf Complex (Central Alps) and implications for the Adula-Cima Lunga nappe systemSchweizerischeMineralogische und Petrographische Mitteilungen 83, 159–172, 2003. https://doi.org/10.5169/seals-63142.
  • Emily E. Mixon, Ann M. Bauer, Jonathan O'Neil, Hanika Rizo, Tyler B. Blum, John W. Valley, Chloë E. Bonamici, Mechanisms for generating elevated zircon δ18O in Archean crust: Insights from the Saglek-Hebron Complex, Canada, Earth and Planetary Science Letters, Volume 624, 2023, 118443, ISSN 0012-821X, https://doi.org/10.1016/j.epsl.2023.118443.

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