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Current Research

The tabs below describe some of my active research projects in the application of isotope geochemistry and geochronology to a wide variety of problems in the geosciences.  All of these projects engage students in the research endeavor; prospective students are encouraged to contact me for more details.

About Research Projects

close up of a hand holding two fossils
Metasequoia preserved in the Clarkia flora of northern Idaho, along with volcanic ash preserved in the same Miocene lake sequence.

Paleoclimate

Green River Early Eocene Climatic Optimum

We are applying high-precision geochronology and innovations in Bayesian age modeling techniques through a large collaborative project focused on the paleolacustrine rock archive of the Green River Formation, and its paleoclimate record. We are working collaboratively with other geochronologists, astrochronologists, sedimentologists, and paleoclimatologists to create a high-resolution age model through this record of the Early Eocene Climatic Optimum between 51 and 49 Ma.  Recent outcomes have included a new Bayesian age model for the Wilkins Peak Member of the Green River Formation based upon new high-precision U-Pb zircon geochronology of ash beds throughout the sequence, which has affirmed the eccentricity forcing of hydroclimate and sedimentation through the sequence. This project has also supported a new methodology for joint inversion of astrochronology and radioisotope geochronology, which can be applied in the future to a variety of sequences across geologic time.

Pacific Northwest Paleobotany in the Mid-Miocene Climatic Optimum

Student opportunities are available to work within a large collaborative project focused on the paleolacustrine rock archives of the Miocene of the Pacific Northwest, and paleoclimate proxy records of the Mid-Miocene Climatic Optimum. We are working collaboratively with paleobotanists studying macroflora, pollen, and phytoliths to create a high-resolution age model through this record of the Mid-Miocene Climatic Optimum between 17 and 14 Ma.

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