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Front and back covers: A perspective view of the geology around Butte, Montana. The position and field of view of the observer are indicated by the triangle on the wire-frame rendition (above) and the geologic map (facing page). Inside front cover: Wire-frame rendition of the topographic data for a portion of the Butte, Montana, quadrangle. Facing page: Shaded relief image of the generalized geologic map for a portion of the Butte, Montana, quadrangle. The generalized geologic and topographic data were digitally merged to create this image. The data were further processed to create the view on the cover.