Supplemental Material: Middle Miocene faulting and basin evolution during central Basin and Range extension: A detailed record from the upper Horse Spring Formation and red sandstone unit, Lake Mead region, Nevada, USA

Item S1: Detailed methods used by the New Mexico Geochronology Research Laboratory at New Mexico Tech for the ⁴⁰Ar/³⁹Ar and tephrochronologic analyses and additional data on the six new dates. Item S2: Detailed map of the Bitter Ridge and White Basin. Items S3–S8: Detailed measured sections and chronostratigraphic panels.