USGS Radiogenic Isotope Facility Personnel prescription drug patent expiration viagra commercial actress Wayne Premo – Research Geologist

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enter Wayne’s research interests include secular marine chemical and isotopic changes, mineral deposit systems that formed in long-lived and reactivated continent-scale tectonic zones, temporal and tectonic evolution of crustal blocks within southern California and evolution of Proterozoic terranes of the central and southwestern United States.

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get link source Leonid Neymark – Research Chemist

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Leonid’s area of expertise is isotope geochemistry and geochronology


 Jim Paces – Research Geologist

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Jim is engaged in various studies of climate change, landscape evolution, paleoseismicity, paleontology, and water sources/flow processes using U-series- and Sr-isotope data obtained from opaline silica, tufa, travertine, speleothems, bone, paleosols, peat, and water.




go to link Kathleen Simmons – Geologist

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