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Publications

Please use the provided citations below when referencing our publications.

Llewellyn GT, Dorman F, Westland JL, Yoxtheimer D, Grieve P, Sowers T, Humston-Fulmer E, Brantley SL (2015) Evaluating a groundwater supply contamination incident attributed to Marcellus Shale gas development. PNAS 112(20):6325-6330. doi: http://dx.doi.org/10.1073/pnas.1420279112  Please see our FAQ!

Llewellyn GT (2014) Evidence and mechanisms for Appalachian Basin brine migration into shallow aquifers in NE Pennsylvania, USA. Hydrogeol. J., http://dx.doi.org/10.1007/s10040-014-1125-1  You may freely download the accepted manuscript by clicking HERE.  The final accepted publication is available from Springer at the DOI listed above.

Brantley SL, Yoxtheimer D, Arjmand S, Grieve P, Vidic R, Pollak J, Llewellyn GT, Abad J, Simon C (2014) Water resource impacts during unconventional shale gas development: The Pennsylvania experience. Int. J. Coal Geol. http://dx.doi.org/10.1016/j.coal.2013.12.017


Llewellyn, G. T. 2012. Hydrogeologic Conceptual Modeling and Geochemical Considerations for Evaluating Groundwater Flow and Gas-Drilling Impacts throughout Susquehanna County, PA: Marcellus Seminar Series, Marcellus Center for Outreach & Research, The Pennsylvania State University, presented on April 24, 2012.

Llewellyn, G. T. and W. J. Llewellyn 2012. Baseline Hydrogeologic Conceptual Modeling and Geochemical Considerations for Evaluating Groundwater Flow and Gas Drilling Impacts Throughout Susquehanna County, PA: A Focus Area of Marcellus Shale Gas Development:  New York – Philadelphia Section Meeting, Association of Environmental and Engineering Geologists, presented on March 21, 2012

Llewellyn, G. T. 2012. Structural and Topographic Assessment of Bedrock Permeability Variations, Susquehanna County, PA: A Focus Area of Marcellus Shale Gas Development: Colloquium Series, Binghamton University, presented on November 4, 2011


Llewellyn, W. J.  2010.  Gas drilling in Susquehanna County:  Aquifer characteristics and water quality considerations.  Presentation sponsored by The Susquehanna County League of Women Voters on March 12, 2010.  Elk Lake High School, Elk Lake, PA





Parizek, R. R. and G. Llewellyn. 2005, 2004, 2003, 2002. Forecast of Loading Report. Office of Physical Plant, The Pennsylvania State University, University Park, PA. (This is an annual report to the PADEP summarizing ongoing research and its findings related to Penn State’s Living Filter Project)