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Colorado State University
Department of Geosciences
Paleoclimate And earth System Theory Group
We use the geologic past to understand why climate on Earth changes and what the consequences are for terrestrial landscapes and ecosystems
Masters and PhD Student Opportunities
We are always looking for students interested in studying past climate, the geological carbon-cycle, or interactions between weathering, erosion, and climate. If that's you, contact Jeremy. If you'd like more information about the graduate program in the Department of Geosciences at CSU, click here.
Check out the new PATCH Lab online database
The Paleo Analysis of Terrestrial Climate and Hydrology (PATCH) Laboratory is now online! This database curates more than 27,000 stable isotope measurements from Cenozoic terrestrial sediments in the northern Hemisphere. The laboratory also includes several simple models to aid in data interpretation.
See the accompanying paper in American Journal of Science.
Recent Publication Figures!
Modern water δ18O across the Dinarides Range in Croatia and Bosnia & Herzegovina. Left-hand panels show δ18O along a transect in northern Croatia (where Dinarides topography is more muted) and right-hand panels show δ18O along a transect across the highest part of the Dinarides. Not the close coupling between δ18O and elevation and the recovery to slightly higher values further from the coast. (from Sanchez Ortiz et al. 2026).
Conceptual model illustrating recharge sources for the Denver Basin Aquifer System (DBAS) south of Denver, in the area of the Town of Castle Rock. Sources of recharge were traced using oxygen and hydrogen isotopes as well as hydrologic measurements of water exchange on the basin floor. ET = evapotranspiration (from Ronayne et al. 2025).
GeoPAST Group
GeoPAST Group
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