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In Fiscal Year 2001, the U.S. Geological Survey (USGS) started a new postdoctoral research program called the Mendenhall Postdoctoral Research Fellowship Program (now the Mendenhall Research Fellowship Program) in honor of Walter C. Mendenhall (1871-1957), the fifth Director of the USGS. The Program provides Fellows research experiences that enhance their scientific stature and credentials.
Walter C. Mendenhall joined the USGS in 1894 where he mapped Appalachian coal fields, did pioneering work on the geology of Alaska, and became one of the first groundwater specialists in the Water Resources Branch in 1903.
Mendenhall research opportunities are available throughout the year. Check back often to see what's open!
Documents that must be included in the application and submission information.
In this paper, we present comprehensive data on stress orientation and relative magnitude in areas throughout North America where unconventional oil and gas are currently being developed. We find excellent agreement between maximum horizontal principal stress (SHmax) orientations over a wide range of depths, using multiple methods. In all basins studied, we observed coherent stress fields that in
Triple oxygen isotope (∆17O with δ18O) signals of H2O and O2 found in sulfate of oxidative weathering origin offer promising constraints on modern and ancient weathering, hydrology, atmospheric gas concentrations, and bioproductivity. However, interpretations of the sulfate-water-O2 system rely on assuming fixed oxygen-isotope fractionations between sulfate and water, which, contrastingly, are sho