Lava Mountains
Geology
The mountains are located along the Garlock Fault. The Blackwater fault passes through the southwestern part of the area, and the Brown's Ranch fault zone and its associated faults pass through the western part.
The pre-Tertiary rocks in the area mainly consist of quartz monzonite. The major sedimentary unit is the Bedrock Spring Formation, which is chiefly composed of arkosic sandstone and conglomerate, as well as some silstone and brecciated volcanic rocks. That formation is overlain by the Almond Mountain volcanics and the Klinker Mountain volcanics in the eastern and western parts of the region, respectively. Overlying these are flows of Lava Mountains andesite dating to the late Pliocene, which are finally covered by Quaternary gravels, alluvium, and travertine. All of the volcanic rocks in the area are plagioclase andesite porphyries.
References
- ^ "Lava Mountains". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2009-05-04.
- ^ Smith, George Irving (1956). Geology and Petrology of the Lava Mountains, San Bernardino County, California (phd thesis). California Institute of Technology.
- ^ "Golden Valley Wilderness". Bureau of Land Management. Retrieved 2024-07-09.
- ^ Keenan, Deborah L (2000-01-01). "The geology and geochemistry of volcanic rocks in the Lava Mountains, California: Implications for Miocene development of the Garlock Fault". UNLV Retrospective Theses & Dissertations. doi:10.25669/86xt-tu2t.