Publications

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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., Grieve, P. et al. (2013) Characterization of a Gas-Drilling Impacted Fractured Rock Aquifer in Wyalusing, Bradford County, PA. Geological Society of America: Abstracts with Programs, 45(1):47

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, G. T. 2011. Structural and Topographic Assessment of Shallow Bedrock Permeability Variations Throughout Susquehanna County, PA: A Focus Area of Marcellus Shale Gas Development. Geological Society of America: Abstracts with Programs, 43(5): 567.

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

Llewellyn, G. T. 2005. Statistical analyses of hydrogeologic factors influencing well yield and permeability in south-central Pennsylvania. M.S. Thesis. The Pennsylvania State University, University Park, PA.

Llewellyn, G. T. and Parizek, R. R. 2005. Hydrogeologic significance of reverse faults, Ridge and Valley Province, PA. Geological Society of America: Abstracts with Programs. 37(7): 245.

Parizek, R. R., O’Driscoll, M. A., and Llewellyn, G. T. (Presenter). 2004. Nourishment of wetlands adjacent to Penn State’s Living Filter Project: Importance of Multiple Lines of Evidence. Geological Society of America: Abstracts with Programs. 36(5): 388

Llewellyn, G. T. 2001. Characterizing shallow subsurface seismic anomalies at Hierakonpolis, Egypt. B.S. Thesis. The Pennsylvania State University, University Park, 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)