Three geologic/geophysical transects in the Baird Mountains quadrangle in the western Brooks Range, Alaska, provide important insights on the nature of major structures in the area. Independently constructed geologic and geoelectric cross sections show strong correspondence between modeled audiomagnetotelluric resistivity data and mapped surface and inferred subsurface geologic structures. Major features reinforced by this correspondence include (1) the great thickness of the Maiyumerak mafic igneous rocks, (2) the north-northwestward vergence of the duplex involving sedimentary rocks of the Baird, Endicott, and Lisburne groups, (3) folding and steep normal fault truncation of the thrust faults in this duplex, (4) the westward dipping structural contact between mixed lower Paleozoic metasedimentary rocks exposed along Tukpathlearik Creek and the more homogeneous underlying quartz-mica schists of the schist belt, (5) a structural detachment beneath Proterozoic metasedimentary and meta-igneous basement rocks exposed in the northeastern part of the quadrangle, and (6) prominent west dipping structures that represent lateral ramps associated with northward transport of thrust sheets in the western Brooks Range during regional north directed Brookian deformation and west dipping structures that developed during a post-Brookian east-west compressional event which folded the imbricated thrust sheets as a package. Audiomagnetotelluric (AMT) data provide a useful and effective mapping tool in areas of limited to poor exposure and in areas affected by permafrost such as northwestern Alaska. Modeled AMT data supplemented geologic data and constrained geologic interpretations.