Environmental Sciences
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Environmental Sciences Experts

Sam A Johnstone

Researcher
Geology
The U.S. Geological Survey
United States Virgin Islands

Biography

Sam A Johnstone,Research Geologist USGS Central Mineral and Environmental Resources Science Center

Research Interest

Geomorphology Thermochronology Topographic analysis Numerical modelling

Publications

  • Soil development over mud-rich rocks produces landscape-scale erosional instabilities in the northern Gabilan Mesa, California Johnstone, S.A., Chadwick, K.D., Frias, M., Tagliaro, G., and Hilley, G.E., 2017, Soil development over mud-rich rocks produces landscape-scale erosional instabilities in the northern Gabilan Mesa, California: Geological Society of America Bulletin, p. B31546.1, doi: 10.1130/B31546.1.

  • LA-ICP-MS depth profile analysis of apatite: Protocol and implications for (U–Th)/He thermochronometry Johnstone, Samuel, Jeremy Hourigan, and Christopher Gallagher. "LA-ICP-MS depth profile analysis of apatite: Protocol and implications for (U–Th)/He thermochronometry." Geochimica et Cosmochimica Acta 109 (2013): 143-161.

  • Lithologic control on the form of soil-mantled hillslopes Johnstone, Samuel A., and George E. Hilley. "Lithologic control on the form of soil-mantled hillslopes." Geology 43.1 (2015): 83-86.

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