These cross-sections and maps fulfill part of a project for the U.S. Geological Survey under cooperatiue agreement NO. 14-08-001-A-0092 (Geologic Characterization of the Basin and Range Province), as a means of characterizing the surface and subsurface geology of western Arizona, ultimately as an aid to better understand regional hydrology. The northeast-trending cross sections (AT-l to AT-20) were constructed, with some modifications, along alternate cross-section lines drawn by Carl Richardson (Arizona Geological Society.1 Digest v. 10, p. 1-6), with a vertical exaggeration of lOx. The downvalley cross-sections (AL-l to AL-15) were constructed to approximate valley-center conditions. The constructions utilized all available recent geological literature as shown on reference sheets 26-35. Comparison of Mr. Richardson's geologic interpretations with those of the present report are some indication of the data accumulated in the past decade since his were open-filed.