This is to review the continuous hiking trail that comprises Blue Oaks Trail (2.0 miles), High Peaks Trail (0.6 miles), and a part of High Peaks Trail named, "steep and narrow section" by the map provided at the Visitor's Center. This steep and narrow section consists of a narrow stone area having steps carved out of the volcanic stone, where this narrow area includes a steel bannister. The steel bannister is needed to prevent hikers from falling to their doom. Once you have hiked up the northern half of High Peaks Trail and have reached the top, it is not clear how to get back down. At the top, there is an unmarked trail (it has no name) that leads 50-feet down to a viewing point and then stops. Also at the top are two trails that take you down into Juniper Canyon and to the parking lot at the west entrance. To hike back down to parking lot, you need to find a tiny little trail sign that reads, "BEAR GULCH" and then take that trail. On six different occasions during the past ten years, I have hiked the entire High Peaks Trail, each time starting from the parking lot near the trailhead for Condor Gulch Trail or from the parking lot near the trailhead for Blue Oaks Trail. High Peaks Trail provides a comfortable aerobic workout. In my experience, the steepest hikes in the S.F. Bay area can be found on West Ridge Trail in Tilden Park. But High Peaks Trail never gets this steep. My attached photographs include photos of:
(1) Lichen growing on rocks next to Blue Oaks Trail.
(2) "Old Man's Beard" (a lichen) hanging from trees near Blue Oaks Trail. This lichen is also called beard lichen of the genus Usnea. Photographs of beard lichens are available from, "pointreyesnature dot com/alamea-trail." Colorful lichens that grow on rocks include, Xanthoria elegans, Rhizoplaca melanopthalma, and Saxicolous lichens.
(3) View from High Peaks Trail of Balconies in the distance to the north.
(4) Photograph of me posing near the edge of High Peaks Trail.
(5) Photo of a hiker on the "steep and narrow section" w/ metal bannisters.
(6) Trail sign showing where Condor Gulch Tr. meets High Peaks Tr.
(7) Indian Warrior plants at the edge of Blue Oaks Trail. Indian Warrior is a parasitic plant that thrives by attaching itself to the roots of manzanita. Manzanita shrubs grow near Blue Oaks Trail.
(8) Stone formation resembling a 100-foot tall stone hand with fingers pointing upwards. This formation is part of Hawkins Peak, and it is best viewed from Condor Gulch Trail.
(9) Mountain goat near top of High Peaks Trail. This same mountain goat is on my YELP reviews for Golden Spike Trail, Bolinas Ridge Trail, and Tomales Point Trail.
HOW PINNACLES CAME TO BE. Between 22-23 million years ago, volcanoes erupted in southern California at a location called, Neenach, in the Mojave Desert. The result was a huge area of volcanos, situated on both sides of the Pacific Plate and North American Plate. Over the course of the past 20 million years, these two plates have continued to move, relative to each other. The result was that the volcanoes destined to become Pinnacles National Park split off, and moved northwards at a rate of one to three centimeters per year. The term "split rate" is used to describe this movement. San Andreas Fault occurs at the meeting point between these two plates. Neenach Volcano is located in Los Angeles County, seven miles east of Route 5. To view the big picture, the mountains in Pinnacles Nat'l. Park used to be located in what is now Los Angeles County.
REFERENCES
(1) John Sims. Chronology of Displacement on the San Andreas Fault in Central California. Dept. of the Interior. U.S. Geological Survey (43 pages).
(2) Frank De Courten. Geology of Southern California. Dept. Earth Sciences, Sierra College (48 pages).
(3) Robert J. Keiffer (2012) Indian Warriors Welcome Spring at HREC. University of California Hopland Research and Extension Center.
(4) Toni Corelli (Botanist, Curator Emeritus of the Carl Sharsmith Herbarium) Plants That Like Hosts.
(5) K. Knudsen and T. Carlberg (2005) Bulletin of the California Lichen Society. Vol. 12, No. 2, page 36. read more