Grieve PL, Hynek SA, Heilweil V, Sowers T, Llewellyn G, Yoxtheimer D, Solomon DK, Brantley SL (2018) Using environmental tracers and modelling to identify natural and gas well-induced emissions of methane into streams. Applied Geochemistry https://doi.org/10.1016/j.apgeochem.2017.12.022
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
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
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. 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, 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.
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