EDMAP GEOLOGIC MAP OF THE SADDLE PEAK HILLS 7.5' QUADRANGLE, DEATH VALLEY NATIONAL PARK, SAN BERNARDINO COUNTY, CALIFORNIA
The quadrangle is located at the junction of three major tectonic provinces: the Basin and Range to the north and east, the Transverse Ranges to the west, and the Mojave Province to the east. The junction of two major transform faults, the Garlock Fault and the Southern Death Valley Fault Zone, is less than 1km to the south of the quadrangle boundary. Inferred Mesozoic compressional tectonism (C-1) is evident in south-southeast trending folds. The oldest extensional (E-1) episode includes down-to-the-west normal faults, which are generally flat lying at present. E-2 includes northwest-striking normal faults and similarly oriented Miocene (ca. 12.6-12 Ma) trachytic dikes as well as volcanic rocks, and monolithologic breccias of landslide-origin inferred to fill paleograbens. E-3 includes north-striking normal faults. E-4 includes inferred north- and northwest-striking range-bounding normal faults along the west sides of the Saddle Peak, Sperry and Salt Spring Hills. Effects of late Neogene transpression in the Avawatz Mountains (T-1) may be evident in pervasive northwest oriented cleavage in the Kingston Peak Formation and in Neogene dikes throughout the quadrangle.