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Kuehn, Stephen
Stephen Kuehn
Title: Associate Professor of Geology/Director CU Electron Microprobe Laboratory
College: College of Science, Mathematics, and Health
Department: Department of Physical and Environmental Sciences
Phone: 304-384-6322
Discipline: Geology
Room: S106
Office Hours: Monday and Wednesday: 10:00am-11:00am
Thursday: 2:30pm-3:30 pm
Box: F20

Stephen Kuehn


Biography

2010-present: Concord University
2009-2010: Visiting Assistant Professor, Department of Geology, Washington and Lee University
2007-2009: Post-Doctoral Research Fellow, Earth and Atmospheric Sciences, University of Alberta, Canada
2002-2006: Visiting Lecturer in Geology, California State University, Stanislau

Education

Ph.D., M.S.,  Washington State University
B.S., University of Puget Sound

Research

Tephrochronology, the use of volcanic ash (tephra) layers to provide correlations between sites and age control - including:

- analytical methods for obtaining geochemical data (e.g. electron microprobe, ICP-OES), including the development of new procedures and new standard reference materials
-cryptotephra (locating and identifying trace volcanic ash that does not occur as visible layers), especially in glacial ice
- applications (e.g. Quaternary geology, climate change, paleolimnology, archaeology, paleoseismology)

* Volcanology & petrology, especially of pyroclastic rocks - including:

-Proximal stratigraphy and geochemistry
- Eruption and depositional mechanisms (from deposit characteristics such as particle size variations and thickness distributions)* Selected field localities:
-Newberry Volcano, Oregon
-Summer Lake and Fossil Lake, Oregon (Great Basin region)
-central Alaska
-Mt. St. Helens, Washington

Recent publications:

Kuehn, S.C., Froese, D.G., and Shane, P.A.R., 2011 (in press), The INTAV intercomparison of electron-beam microanalysis of glass by tephrochronology laboratories, results and recommendations: Quaternary International.

Kuehn, S.C. and Froese, D.G., 2010, Tephra from ice – A simple method to routinely mount, polish, and quantitatively analyze sparse fine particles: Microscopy and Microanalysis.

Kuehn, S.C. and Negrini, R.N., 2010, A 250,000-year record of Cascade Range pyroclastic volcanism from late Pleistocene lacustrine sediments near Summer Lake, Oregon, USA: Geosphere.

Lacelle, D., St-Jean, M., Lauriol, B., Clark, I.D., Froese, D., Kuehn, S.C., Zazula, G., and Lewkowicz, A., 2010, Burial history of a relict perennial snowbank body and vegetation by the Dawson tephra (25,300 14C years BP) near Red Creek, Ogilvie Mountains, central Yukon, Canada: Quaternary Science Reviews.

Microanalysis