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Geological formation - A geological unit or group of units with similar age or type of depositional history, and other geological similarities on larger regional scale.
Geological unit - A volume of rock with similar lighology or other geologic properties.
Geometric mean - A geometric mean, unlike an arithmetic mean, tends to dampen the effect of very high or low values, which might bias the mean if a straight average (arithmetic mean) were calculated. This is helpful when analyzing transmissivity estimates, which may vary over 10 orders of magnitude. A geometric mean is a log (base 10) transformation of data to enable meaningful statistical evaluations.
Groundwater - All water beneath the surface of the ground whether in liquid or solid state.