Water quality and environmental isotopic analyses of ground-water samples collected from the Wasatch and Fort Union Formations in areas of coalbed methane development — Implications to recharge and ground-water flow, eastern Powder River Basin, Wyoming

Hydrogeologic framework, geochemistry, groundwater-flow system, and aquifer hydraulic properties used in the development of a conceptual model of the Ogallala, Edwards-Trinity (High Plains), and Dockum aquifers in and near Gaines, Terry, and Yoakum Counties, Texas

“…The composition of groundwater principally is controlled by the composition of recharge water, water-rock interaction, and the mixing of water from different sources. The term "facies" refers to a classification scheme used to describe water in terms of the major cation and anion milliequivalents composition (Freeze and Cherry, 1979;Bartos and Ogle, 2002). A trilinear (Piper) diagram is a useful tool for evaluating the relative abundance of major cations and anions and classifying facies or water types (Piper, 1944).…”