Trail Boulder
4 boulder problems · Rocks of Montezuma stock and vicinity, Monzogranite porphyry · 9,712 ft
How well located
Crag only 4
No route here has its own point yet. The map pin is the crag. At the wall? Survey it: 30 seconds per route.
Rock, from the geologic map
Rocks of Montezuma stock and vicinity, Monzogranite porphyry. Eocene, about 56 to 34 million years old.
Light-tan to gray, medium-grained, porphyritic, alkali-calcic monzogranite and granodiorite with euhedral to subhedral phenocrysts of orthoclase and quartz. Chemical composition indicates alkali-calcic granodiorite (Ed Dewitt, written commun., 2007). Orthoclase phenocrysts form as much as 20 percent of rock and are locally reported as long as 10 cm (Lovering, 1935). Quartz phenocrysts form as much as 10 percent of rock and are commonly partially resorbed. Matrix contains orthoclase, plagioclase, quartz, as much as 3 percent biotite, and trace amounts of hornblende, magnetite, and sphene. Locally includes light-pink aplite dikes (bma) not mapped separately. Includes several small intrusive bodies near Montezuma stock. Zircon fission-track ages between 39.8±4.2 and 34.8±3.7 Ma (Bookstrom and others, 1987); Cunningham and others (1994) reported a zircon fission-track age of 35.0±3.2 Ma; one K-Ar age is 37.0±1.4 Ma (Marvin and others, 1989)
This is the map unit under this crag's map point, read from the 1:100,000 sheet (Kellogg and others, 2008, USGS Geologic Investigations Series 3000). The point can be a few hundred metres from the rock, a cliff often stands on the line between two units, and at that scale a line on the map is about 100 m wide on the ground, so the wall itself may be the neighbouring unit. Every crag on this unit: Rocks of Montezuma stock and vicinity, Monzogranite porphyry. Geology data: Macrostrat (CC BY 4.0), serving USGS and Colorado Geological Survey maps.
On the map since 1924
The USGS has mapped this ground since 1924. 33 historical sheets cover this crag's map point; the oldest is below.
USGS Historical Topographic Map Collection · Public domain · the record · placed by its coordinates
Report this item
Hidden as soon as you tell us, everywhere it appears, before anyone reviews it.
Public domain, U.S. Geological Survey. The sheet shows the ground as the survey found it then, which is why a trail or road you know may be missing. Every sheet over this point, 1924 to 1983: USGS topoView.
Routes
Also within 3 km
- Hero Boulder17 m · 4 boulder problems · 9,743 ft
- Main Boulder, Hummingbird Boulders65 m · 6 routes and 4 boulder problems · 9,813 ft
- Choss 30 aka 30 Rock aka Pimpin' Ain't Easy85 m · 2 boulder problems · 9,813 ft
- Seam Boulder85 m · 5 boulder problems · 9,813 ft
- Hummingbird Boulder #3119 m · 1 route · 9,893 ft
- Haus Rock142 m · 27 routes and 1 boulder problem · 9,819 ft · Haus Rock
Straight line between the two crags' map points, each of which can be some way from its rock. For when this wall is full, or the sun has found it.
Photos from climbers
No photos here yet. If you're at the crag, yours would be the first.
Taken at the crag by climbers and published as they sent them. Each one's own location had to be within 0.5 km of this crag before we accepted it. See something that shouldn't be here? Use Report this photo under it and it's hidden at once. Anything else, write to us.
Conditions reported
Nothing reported recently.
Report what you see
Reports are dated and fade on their own: wet rock after 3 days, a bad bolt after a year. No names, no text.
Access & safety
The map point for this crag is on land managed by White River National Forest (federal). It lies inside inventoried roadless area, national forest.
Land manager from USGS PAD-US (public domain), read 2026-09-29. It is the manager of the crag's map point, which can be a long way from the wall. What you may do on the rock is the manager's to say, not ours.
Rules for all White River National Forest land
- Rules
- The forest strongly recommends dispersed campers pack out solid human waste using an approved disposable or self-contained system rather than burying it in a cathole.
- Overnight
- Camping more than 14 days in any continuous 30-day period is prohibited, counted from the first day of occupancy. Some places allow dispersed camping only at designated sites and some run a shorter 7-day limit in summer.
Read on White River National Forest's own pages, checked 2026-09-29 by John Crawford. What they require, in full, or their own climbing page. These apply to the manager's whole holding; anything specific to this crag is above.
Nearby, from OpenStreetMap
- Mapped parking
- 839 m away (map)
- Campsite
- Unnamed, 4,729 m away (map)
Distances are a straight line from this crag's map point, which can itself be hundreds of metres off; a road may be much longer. Mapped by OpenStreetMap contributors (ODbL), so a toilet missing here may simply be unmapped. Parking here is what OSM has drawn nearby, not a guidebook's directions.
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