The Millenium Boulder

16 boulder problems · Fountain Formation · 6,338 ft

Help locate these routes: survey the wall

What's here

V1 to V10, with no single grade dominating.

1 V1
2 V3
1 V4
2 V5
2 V6
2 V7
1 V8
2 V9
3 V10

Counted from the 16 climbs here that carry a grade. Shown only where there are at least 5 of them — below that the shape is noise.

How well located

Position on wall known 15 Crag only 1

No route here has its own point yet. The map pin is the crag. At the wall? Survey it: 30 seconds per route.

The order of the climbs along this wall is known from the open catalogue, so a few surveys go a long way: standing at Cargo Cult, Second Coming (aka Revelation?), Lono (3 climbs, about 90 seconds) would place up to 12 more climbs between them. Survey the wall →

“Up to” because the estimate between two surveyed routes is only used when they turn out to be close enough together on the ground.

Rock, from the geologic map

Fountain Formation. Paleozoic, about 323 to 273 million years old.

Maroon and red, arkosic, thick-bedded, coarse-grained to pebbly, cross-bedded fluvial sandstone and conglomerate containing thin layers of dark-maroon, hard (siliceous), micaceous siltstone and silty, fine-grained sandstone. Coarser beds commonly fill shallow channels. Sandstone locally bleached light tan to white. Clasts are well rounded to subrounded, as long as 25 cm, and composed mostly of Proterozoic rocks. Scott (1972) reported rare lower Paleozoic clasts in lower part of formation in Morrison 7.5-minute quadrangle. Thickness in quadrangle about 600 m; in Eldorado Springs quadrangle a measured section is 305 m thick (Wells, 1967). Mapped only in Denver Basin

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: Fountain Formation. Geology data: Macrostrat (CC BY 4.0), serving USGS and Colorado Geological Survey maps.

On the map since 1899

The USGS has mapped this ground since 1899. 25 historical sheets cover this crag's map point; the oldest is below.

Thumbnail of the 1899 USGS sheet covering The Millenium Boulder — **USGS 1:125000-scale Quadrangle for West Denver, CO 1899** · U.S. Geological Survey · 1899 · 1:125,000 sheet
USGS Historical Topographic Map Collection · Public domain · the record · placed by its coordinates

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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, 1899 to 1983: USGS topoView.

Photographs near this crag

Taken within 1.5 km of this crag's map point and published under a licence that lets us show them, from Wikimedia Commons. The coordinates say where the camera was, not what it was pointed at, so some of these will be the creek or the trail rather than the rock.

Red Rocks trail (6452931735) · Maarten Heerlien from Voorschoten, The Netherlands · 2010 · 568 m from the crag's map point
Wikimedia Commons · CC BY · the record · placed by its coordinates

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