Full Name: 
Kuehn, Stephen
Associate Professor of Geology/Director CU Electron Microprobe Laboratory
Primary Department: 
Department of Physical Sciences
College of Natural Sciences, Mathematics, and Health
Telephone #: 
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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

Office Hours: 

Monday and Wednesday: 10:00am-11:00am
Thursday: 2:30pm-3:30 pm


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

Research Interests/Publications: 

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.

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