CAPTION: This map is a three-element display of equivalent uranium (ppm), equivalent thorium (ppm), and potassium (%). Uranium is displayed in red hues, thorium in green, and potassium in blue. Different ratios of the three elements are displayed as RGB color combinations. Regions with relatively high concentrations of all elements look white, regions with relatively low concentrations of all elements look dark gray. Each color band is nonlineraly quantized using a histogram stretch to ensure a relatively uniform distribution of levels and to enhance low-contrast areas.