-.-
Devil's Punchbowl
The Devil's Punchbowl: A Geological Marvel of Los Angeles County
Devil's Punchbowl Natural Area occupies 1,310 acres on the northern slopes of the San Gabriel Mountains near Pearblossom and Valyermo. Managed by Los Angeles County, the park lies where the mountains meet the southern edge of Antelope Valley. Steeply tilted sandstone beds, folded rock layers, and eroded canyons expose the geological history of this transition between mountain and desert.
Geology
The park's prominent sedimentary rocks belong to the Punchbowl Formation, which dates to the middle and late Miocene. Sandstone, conglomerate, and finer sedimentary layers record the accumulation of sand, gravel, and mud in an ancient inland basin. Streams carried these materials from surrounding uplands. Geological research indicates that the formation belonged to a larger drainage system and received sediment from sources in the Mojave region.
Burial and cementation gradually turned these sediments into rock. Movement within the regional fault system subsequently folded, tilted, and uplifted the beds. The Punchbowl and Pinyon faults, together with deformation associated with the nearby San Andreas Fault, contributed to the structure visible today. Some beds now stand at steep angles.
Runoff from the higher San Gabriel Mountains cut into the uplifted rocks. Differences in resistance to weathering and erosion helped produce the canyon's walls, ridges, and gullies. Fault movement changed the arrangement of the rock layers, while erosion exposed their interiors and carved the present landscape.
Similar-looking sandstone occurs at Mormon Rocks in Cajon Pass. Comparing these exposures requires care because geological names and age assignments have changed with later research. Their appearance alone does not establish that they were once adjoining deposits.
Plants and Wildlife
Devil's Punchbowl lies between desert and mountain plant communities. Joshua trees, California junipers, pinyon pines, and chaparral shrubs occur in the surrounding landscape. Their distribution changes with elevation, slope, and available moisture. Rocky outcrops, shrublands, and woodland provide habitat for birds, reptiles, and mammals.
The 2020 Bobcat Fire burned through the natural area and altered its vegetation. A biological report completed in 2023 documented recovering chaparral within the area surveyed for the Nature Center replacement project. Burned vegetation and subsequent plant recovery form part of the landscape visitors encounter.
Trails
A short interpretive loop descends into the canyon and returns to the visitor area, providing close views of the tilted sedimentary beds. Although the route is relatively short, hikers must climb back out of the canyon. The Forest Service lists its Devil's Punchbowl Interpretive Trail as 1.3 miles long.
The longer Devil's Chair hike reaches an overlook above the formations. The round trip is approximately 7.5 miles. Portions of the route follow the Punchbowl Fault zone, where crushed and fractured rock provides evidence of fault movement.
The Burkhart Trail connects toward Burkhart Saddle to the southwest, while the Punchbowl Trail extends east toward South Fork Campground. These trails provide connections to longer routes in the San Gabriel Mountains. Check current trail conditions and forest restrictions before planning a through-hike.
Bobcat Fire and Nature Center
The Bobcat Fire destroyed the original Nature Center in September 2020. The park reopened in April 2022, and Los Angeles County has planned a replacement building. Contact the park for current information about visitor facilities and interpretive programs.Visiting
The park entrance is at 28000 Devil's Punchbowl Road. From State Route 138 at Pearblossom, follow Longview Road south to Devil's Punchbowl Road.
The county currently lists operating hours as Tuesday through Sunday, 8:00 a.m. to 7:30 p.m. from March through October, and 8:00 a.m. to 5:00 p.m. from November through February. The park is closed Mondays. For current hours, facility availability, and trail information, call (661) 944-2743.
References
Noble, L. F. 1954. Geology of the Valyermo Quadrangle and Vicinity, California. U.S. Geological Survey, Geologic Quadrangle Map GQ-50.Coffey, K. T. 2015. Oligocene-Miocene Sedimentary and Volcanic Strata of the Vincent Gap Region, Eastern San Gabriel Mountains, Southern California, USA, and Their Tectonic Significance. Master's thesis, University of California, Los Angeles.
Coffey, K. T., Ingersoll, R. V., and Schmitt, A. K. 2019. "Stratigraphy, provenance, and tectonic significance of the Punchbowl block, San Gabriel Mountains, California, USA." Geosphere, 15(2): 479-501.
Chester, Tom, and Strong, Jane. 2005. "Devil's Punchbowl." Field Guide to the San Gabriel Mountains.
ECORP Consulting, Inc. 2023. Biological Technical Report for the Devil's Punchbowl Nature Center Replacement Planning Project.
Los Angeles County Department of Parks and Recreation. Devil's Punchbowl Natural Area and Nature Center; Nature Center replacement project documents.
U.S. Forest Service, Angeles National Forest. Devil's Punchbowl Interpretive Trail.
Big Rock Creek
Mormon Rocks
Mojave Block
Cajon Pass
San Andreas
SR-138
Pearblossom
Burkhart Trail
Big Rock Creek
Mormon Rocks