Category Archives: geology

Goat Peak and the High Point Trail From the Top of Reseda

Goat Peak and the High Point Trail
The High Point Trail

Like many that enjoy our local mountains, I’m always on the lookout for new trails, new peaks, and interesting loops. A couple of months ago, after running to “The Oak Tree” on the Rogers Road segment of the Backbone Trail, I checked out the upper part of the High Point Trail.

This 2-mile long unofficial, unmaintained, use trail connects the Backbone Trail to the Rivas Canyon Trail. My thought was that I could use the trail to do a variation of the Will Rogers – Temescal Canyon Loop. Instead of running down the lower half of Rogers Road Trail to Will Rogers SHP, I could descend the High Point Trail, pick up the Rivas Canyon Trail, and then finish the loop by the usual route. On paper it made perfect sense.

Steep step in Cretaceous-age cobble on the High Point Trail
Steep step in Cretaceous-age cobble on the High Point Trail

As sometimes happens, it wasn’t quite as straightforward as it looked on the map. Blame the dinosaurs. The trail has several steep sections where eroding Cretaceous-age cobble does its best to take you for a ride. Plus, I happened to be using shoes worn smooth by nearly 500 miles of running.

More than one hiker going up the trail commented about my choice to descend the trail. Being careful not to do anything stoopid, the descent — and the rest of the loop — worked out OK.

Since doing the High Point Trail in the wrong direction and with worn-out shoes, I’ve wanted to go back and do a different loop that climbs UP the trail. That’s what I was doing this morning.

Hazy view of Santa Monica Bay from the High Point Trail
Santa Monica Bay from the High Point Trail

The first half of the run was the same as the Will Rogers – Temescal Canyon Loop. However, instead of continuing to Temescal Canyon on the Rivas Canyon Trail, I picked up the High Point Trail at the “cactus garden.” This is about 11.5 miles into the run. (The start of the High Point Trail has closely-spaced steps that have been eroded by runoff.)

As you might expect, going up the High Point Trail was much better than going down. Care was still required, but it was a far more enjoyable experience. Between the steep sections there was a surprising amount of runnable trail.

Chaparral on the High Point Trail.
Running through chaparral on the High Point Trail.

This time my shoe choice was the HOKA Speedgoat. These have a full-length, sticky-rubber outsole. I’ve had many pairs, and it’s my trail running shoe of choice for more difficult terrain.

From the top of Reseda, the Goat Peak High Point Trail keyhole loop worked out to about 20 miles, with about 3300′ of elevation gain. Here’s an interactive, 3D terrain view of a GPS track of the route, zoomed in on the keyhole part of the loop. The map can be zoomed, tilted, rotated, and panned. For help controlling the view, click/tap the “?” icon in the upper right corner of the screen. Track and placename locations are approximate and subject to errors. Poor weather, and other conditions may make this route unsuitable for this activity.

Modelo Mustard

Mustard flowering in Cheeseboro Canyon reveals the underlying structure of a hill.

Mustard flowering in Cheeseboro Canyon reveals the underlying structure of a hill.

According to the Dibblee geologic map of the area, the strata are part of the Modelo Formation. And… the Modelo Trail passes directly over the top of the hill.

The photo was taken on a run from the Victory Trailhead of Upper Las Virgenes Canyon Open Space Preserve to the Cheeseboro Ridge Trail and back.

A Sandstone Mammoth and a Spiral Labyrinth on the Bulldog Loop

A natural sculpture of a sandstone mammoth on the Backbone Trail

Instead of struggling to escape a tar pit, this “mammoth” seems to have been caught up in 25-30 million-year-old sandstone.

The beast can be seen along the Backbone Trail, east of the Corral Canyon Trailhead. When running/hiking/riding east from the trailhead, the trail climbs over two steep steps and up to gap in the rock. In the photo above, the gap is on the left and the mammoth figure is on the right. From the gap, the trail descends a rock corridor to Mesa Peak fire road.

A closer look at the mammoth reveals that it is pockmarked and there are rocks embedded in the sandstone. The embedded rocks are cobble from an ancient river and the pockmarks are where rounded rocks have fallen out of the eroding sandstone.

Spiral labyrinth constructed of ancient stream cobble along the Backbone Trail
Spiral labyrinth along the Backbone Trail

Stream cobble that has eroded out of sandstone formations in this area has been used to construct a spiral labyrinth on the north side of Mesa Peak Fire Road. The cobble was tumbled and smoothed by streams that drained a range much older than the Santa Monica Mountains.

The title photo is from this morning’s run of the Bulldog Loop.

Some related posts: Moon and Sycamores, Malibu Creek State Park; Bulldog Loop Near Corral Canyon

Looking for Boney Bluff

Boney Bluff from the Backbone Trail

Every time I’ve run the Chamberlain segment of the Backbone Trail, I’ve looked at the intriguing rock formation near the top of the trail and wanted to climb it. Looking a bit like an aircraft carrier that’s run aground on a mountain ridge, it’s one of the most prominent peaks along Boney Mountain’s western escarpment. Named “Boney Bluff” by rock climbers, several sport climbing routes were established on the southeast side of the peak in the early 2000s.

Located just northwest of the junction of the West Tri Peaks Trail and the Backbone Trail, the peak is visible from many points in Pt. Mugu State Park. According to lidar-based 1-meter resolution 3DEP data, its elevation is 2985′, which is slightly higher than the 3DEP elevation of nearby Exchange Peak.

Boney Mountain plateau.
Boney Mountain plateau. Click for larger image.

Boney Bluff is one of many small peaks and rock formations that are found across the Boney Mountain plateau. Comprised of a fused mishmash of volcanic breccia, the rock quality of these formations ranges from very good to quite bad. Seemingly solid handholds or footholds can break, and because of the way the rock erodes, low-angle sections are often littered with granular rocks that can be very slippery.

Boney Bluff from the east.
Boney Bluff from the east.

Having climbed the Western Ridge on Boney Mountain, I approached Boney Bluff from the north, via the Tri Peaks Trail. My route climbed a slope to the east side of the peak, then traversed right to the base of a jumbled face with several oddly eroded ledges. A short, steep crack and grassy ramp provided access to the ledges above. NOTE: There may be a better way to climb the peak. I was trying to do a relatively direct route and avoid bushwhacking. The route is somewhat manky, but worked for me.

Summit block of Boney Bluff
Summit block of Boney Bluff.

The high point of the peak is on top of a summit block that caps the “island of the carrier.” Many of the formations on Boney Mountain have summit blocks, and these are often the most difficult part of the climb. Rule #1 involving summit blocks: Don’t climb up anything you can’t 100% for sure climb down! This one looked like it might be tricky, but with careful route-finding was pretty straightforward.

Because Boney Bluff is perched on the edge of the Boney Mountain plateau, on a clear day there are outstanding panoramic views of Pt. Mugu State Park and the Boney Mountain area from its summit. Today, the visibility was excellent and Mt. Baldy was visible, 75 miles to the east.

Lidar-based 3DEP Elevation Estimates of Some Boney Mountain Peaks
Lida-based 3DEP elevation contours of Boney Bluff. Click for a larger image.

The resolution of the 3DEP Elevation Data is very impressive. While checking the elevation of Boney Bluff, I also noted the 3DEP elevation of several other peaks in the Boney Mountain area. For more info about 3DEP see this U.S.G.S. website.

  • Sandstone Peak 3116′
  • Tri Peaks 3039′
  • Boney Bluff 2985′
  • Boney Crest 2974′ (Accessed via Western Ridge or Cabin Trail)
  • Exchange Peak 2969′
  • Big Dome 2934′
  • Boney Peak 2849′ (Both summits)
  • Inspiration Point 2811′

Some related posts: Looking for Boney Mountain, Looking for Boney Peak

An Out-of-the-Way Trail, Two Peaks, a Wheelbarrow, and Washington’s Monument

Forsee Creek canyon from the John's Meadow Trail in the San Gorgonio Wilderness.

Wow, what a fantastic trail, canyon, and morning!

The view above is from the John’s Meadow Trail, a circuitous trail that winds its way through a less-traveled part of the San Gorgonio Wilderness.

Sugar pine cones
Sugar pine cones along the John’s Meadow Trail.

The prominent canyon in the photo is home to Forsee Creek. During the last ice age, it held one of San Gorgonio’s small glaciers. I’d just crossed the Forsee Creek a few minutes before, and in a few hours would run past its source high on the crest — Trail Fork Springs.

The peak at the head of the canyon is East San Bernardino Peak (10,691′). Its summit marks the crest of the divide and the location of the San Bernardino Peak Divide Trail. That’s where I was headed, but the path would be anything but direct.

From the Forsee Creek crossing at 7270′, the John’s Meadow Trail climbs about 1000′ in 2.3 miles to join the Divide Trail at “wheelbarrow junction,” about 5 miles west of East San Bernardino Peak. From that point I worked up the popular and scenic Divide Trail, visiting Limber Pine Bench (9330′), Washington Monument (10,290′), and San Bernardino Peak (10,649′) along the way to East San Bernardino Peak.

A weather-beaten lodgepole pine at Limber Pine Bench on the San Bernardino Peak Divide Trail.
Weather-beaten lodgepole pine.

Using this roundabout — but very scenic — route, it took me about the same time to reach San Bernardino Peak from the Forsee Creek Trailhead as it does to do San Gorgonio Mountain from the South Fork Trailhead. From San Bernardino Peak it’s a little less than a mile to East San Bernardino Peak and from there only about 0.75 mile to the lateral to Trail Fork Springs.

From the westernmost Trail Fork Springs junction with the Divide Trail the theme was downhill, downhill, and more downhill — about 3800′ of downhill over 6.7 miles.

The running on the Forsee Creek Trail was generally very good. I was glad I did the loop counterclockwise. The John’s Meadow Trail and its extension are enjoyably primitive — they appear to be “use” trails that have evolved over time. On the other hand, the Forsee Creek Trail is a constructed trail. It was designed as a pack trail, so is generally well-behaved. Great for going down, but a long haul up with a heavy pack!

San Gorgonio Mountain and San Jacinto Peak from East San Bernardino Peak.
San Gorgonio and San Jacinto from East San Bernardino Peak.

Here are a few photos taken along the way, and here is an interactive Cesium ion view of the GPS trace of my route. The 3D view can be zoomed, tilted and panned.

Note: Water is generally more reliable and accessible on the John’s Meadow Trail than on the Forsee Creek Trail. Trail Fork Springs and Jackstraw Springs are seasonal water sources that may not have water. Check with the Mill Creek Ranger Station for the current conditions and more info.