For the tectonic, structural, or surficial geologist, a geologic map is the ultimate document, encompassing within its bounds a concise display of the current status of geologic information for the region that it embraces. Because the state of Maine, areally, is half of the New England region, the new bedrock and surficial maps of that state, produced under the direction of State Geologist Walter Anderson with the collaboration of 13 bedrock area compilers, 12 surficial areal compilers, and aided by funding from the U.S. Department of Energy and the Maine Geological Survey, are important contributions to our knowledge of this portion of the northern Appalachian Mountains. These maps follow closely upon recently published bedrock maps of Massachusetts (E.-A. Zen et al., U.S. Geological Survey, Washington, D.C., 1983) and Connecticut U. Rodgers, Connecticut Geological and Natural History Survey, Hartford, 1985). Revisions of maps for the other New England states are in progress.