In a collaborative effort with the University of Saskatchewan, we reported one of the largest observed carbon isotope effects caused by diffusional fractionation from a site in southern Saskatchewan. The literature provides no clear explanation for large, well-defined changes in the δ13C values of methane (>5‰) with depth [Xia and Tang, 2012]. Some authors attribute the changes to the effects of methane transport in the subsurface [Prinzhofer and Huc, 1995; Prinzhofer and Per

In a collaborative effort with the University of Saskatchewan, we optimized methods to generate profiles of dissolved methane and ethane concentrations and the carbon isotopes of methane during drilling programs through argillaceous shales and tills in southern Saskatchewan. Find the article in Groundwater at: http://onlinelibrary.wiley.com/doi/10.1111/gwat.12445/full