Examination of 30+ year old published 1:48,000-scale geologic maps and Google Earth imagery, and field reconnaissance suggest Cenozoic volcanic-filled paleovalleys in the Gabbs Valley Range, NV (central Walker Lane) are dextrally offset by five major faults, including the Petrified Spring fault (figs. 1 and 2). New detailed geologic mapping, structural studies, and ⁴⁰Ar/³⁹Ar geochronology document offset markers across the Petrified Spring fault and form the first dataset to constrain the geometry and pre-Pleistocene slip history of the Petrified Spring fault.