Dr. Paul J. Umhoefer

Paul Umhoefer 230px


Ph.D. University of Washington, 1989


Office: Director—bldg #12, room 100; Research—bldg #13, room 307
Phone: 928-523-1637
Email: paul.umhoefer@nau.edu

Research Interests

My research is focused on Tectonics of the Cenozoic Era. My main research interest is in the tectonic evolution of, and processes that form, oblique plate boundaries. More specifically, I study basins and related faults that form in these settings, and the processes and evolution of areas with mixed strike-slip and dip-slip faulting. My research is field and lab based and my students and I use the methods of structural geology, stratigraphy, and related disciplines to understand tectonic problems.



Lamb, M., Beard, L.S., Hickson, T., Umhoefer, P.J., Dunbar, N., Schleicher, J., and McIntosh, W., 2015, Late Oligocene–early Miocene landscape evolution of the Lake Mead region during the transition from Sevier contraction to Basin and Range extension; GSA Bulletin; doi:10.1130/B31144.1.

Umhoefer, Paul J., Sara J. Maloney, Beverly Buchanan, J Ramón Arrowsmith, Genaro Martinez-Gutiérrez, Graham Kent, Neal Driscoll, Alistair Harding, Darrell Kaufman, and Tammy Rittenour 2014, Late Quaternary faulting history of the Carrizal and related faults, La Paz region, Baja California Sur, Mexico: Geosphere, v. 10, no. 3, p. 1-29, doi:10.1130/GES00924.1.

Coyan, Melanie, M., J Ramón Arrowsmith, Paul Umhoefer, Joshua Coyan, Graham Kent, Neal Driscoll, and Genaro Martínez Gutíerrez, 2013, Geometry and Quaternary slip behavior of the San Juan de los Planes and Saltito fault zones, Baja California Sur, Mexico: Characterization of rift-margin normal faults: Geosphere; v. 9; no. 3; p. 426–443; doi:10.1130/GES00806.1.

Sutherland, Kent, Harding, Umhoefer, P.J., Lizarralde, Holbrook, Gonz´alez-Fern´andez, Fletcher, Axen, 2012, Middle Miocene to early Pliocene oblique extension in the southern Gulf of California: Geosphere, v. 8, 752-770.

Brothers, Daniel, Alistair Harding, Antonio González-Fernández, W. Steven Holbrook, Graham Kent, Neal Driscoll, John Fletcher, Dan Lizarralde, Paul Umhoefer, and Gary Axen, 2012, Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California: Geophysical Research Letters, vol. 39, L09307, doi:10.1029/2011GL050828.

Dorsey, R.J., and Umhoefer, P.J., 2012, Influence of sediment input and plate-motion obliquity on basin development along an active oblique-divergent plate boundary: Gulf of California and Salton Trough, Tectonics of Sedimentary Basins: Recent Advances, First Edition. Edited by Cathy Busby and Antonio Azor, Blackwell Publishing Ltd., p. 209 – 225.

Umhoefer, P.J., 2011, Why Did the Southern Gulf of California Rupture So Rapidly? Oblique divergence across hot, weak lithosphere along a tectonically active margin: GSA Today, v. 21, no. 11, p. 4-10, doi: 10.1130/G133A.1.

Fry, M.C, A.E.Springer, and P.J. Umhoefer, 2011. Hydrogeologic implications of a fault scaling relationship in bedrock aquifers, Environmental & Engineering Geoscience, Vol. XVII, No. 4, p. 377–389.

Busch Melanie M., J Ramon Arrowsmith; Paul J Umhoefer, Joshua A Coyan, Sara Maloney, and Genaro Martínez Gutiérrez, 2011, Geometry and evolution of rift-margin, normal-fault-bounded basins from gravity and geology, La Paz - Los Cabos region, Baja California Sur, Mexico; Lithosphere, doi:/L113.1.

Umhoefer, P.J., Beard, L.S. Martin, K.L. Blythe, N., 2010, From detachment to transtensional 
faulting: A model for the 
Lake Mead extensional domain based on new ages and correlation of subbasins, in Umhoefer, Paul J., Lamb, Melissa A., Beard, L.S., eds., Miocene Tectonics of the Lake Mead region: Geological Society of America Special Paper 463, p. 371-394.

Lamb, M., K.L. Martin, T. 
P.J. Umhoefer, L. Eaton, 2010, Deposition and age of the lower Horse Spring Formation in the 
Longwell Ridges area, in Umhoefer, Paul J., Lamb, Melissa A., Beard, L.S., eds., Miocene Tectonics of the Lake Mead region: Geological Society of America Special Paper 463.

Blythe, N.  Umhoefer, P.J., Duedendorfer, E.M. and Beard, L.S., 2010, Development of Salt Spring Wash basin in the hanging wall of the White Hills detachment fault, Lake Mead domain, in Umhoefer, Paul J., Lamb, Melissa A., Beard, L.S., eds., Miocene Tectonics of the Lake Mead region: Geological Society of America Special Paper 463.


Note: italics are Northern Arizona University graduate students