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.

Learn more about some of our initiatives

Diversity, inclusion, and equity in the Geosciences

Sam Bowring Fund – Meet our 2025 recipients!

Community report recommendations

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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Announcements

Urgent Call for Nominations: Research Grants Committee Member-at-Large

By: Rebecca Taormina , 10 months ago

At the close of Committee Nominations on 15 June, we did not receive any nominations for the Geochronology Member-at-Large position on the GSA Research Grants Committee. Each year, graduate research grant proposals are submitted in geochronology and related fields, and GSA needs qualified reviewers to ensure these proposals receive the attention and expertise they deserve.

We’re asking members of the Geochronology Division to consider stepping up and nominating themselves for this important volunteer role.

🔹 Position: Member-at-Large, Geochronology – Research Grants Committee
🔹 Term: 1 December 2025 – 30 June 2028 (3 years)
🔹 Time Commitment: Proposal review season runs March–May; committee is inactive the rest of the year.

The Nominations Portal has been reopened through Wednesday, 18 June. To access it, please contact Macie Schiller (mschiller@geosociety.org) for the temporary password and with any questions.

This is a vital opportunity to support graduate students and contribute your expertise to the future of geochronology. Please consider nominating yourself today!