The Warner Mountains are a north-south trending fault block range in the northeastern corner of California, extending northward into Oregon. The length of the range is approximately 90 miles, with the northern California portion bounded by Goose Lake on the west and Surprise Valley on the east. In California, elevations range between 5,000-9,897 feet (on Eagle Peak). In the High Grade district, which is the extreme northern limits of the Warners in California, the range has a fairly even crest of 7500 feet, reaching an elevation of 8290 feet on Mount Bidwell. This is the area where I spent four days mapping and monitoring whitebark pine (Pinus albicaulis) for the US Forest Service.
The geology of the region is complex and compelled me to understand it better. Bedrock consists of sedimentary rocks of the Oligocene overlain by rhyolitic to basaltic volcanic rocks of the Miocene. The basal andesite is overlain by rhyolite and glassy rhyolite, which are in turn overlain by basalt flows. There are valuable minerals and gems found in this area that have justified a long-standing history of mining. Gold was the first and major extracted mineral soon followed by opals, petrified wood, and even obsidian. The range is a complex assemblage of interesting rocks for sure which help sculpt the regional ecology.
My July 2018 trip is a part of a follow up study to work we started in 2012, supported by the US Forest Service Region 5 in collaboration with the California Native Plant Society (me!). On this trip, I was able to visit sites that I did not in 2012. These were all areas that I predicted to have stands of whitebark pine but that had never been documented. What follows are images and captions from the journey.
A few other highlights: