Sawtooth Ridge, Mt. Bierstadt/Evans combo

1 route · Granodiorite of Mount Evans batholith · 13,802 ft

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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.

Rock, from the geologic map

Granodiorite of Mount Evans batholith. Mesoproterozoic, about 1,600 to 1,000 million years old.

Gray, massive to strongly foliated, coarse-grained, mostly porphyritic biotite-hornblende granodiorite, which ranges in composition from monzogranite to tonalite (Aleinikoff and others, 1993a). Locally contains as much as 5 percent of an aplite-pegmatite phase consisting of dikes and irregular-shaped bodies of massive to weakly foliated aplite and magnetite-bearing pegmatite. Formerly believed to be part of the Early Proterozoic Routt Plutonic Suite of Tweto (1987), due to petrographic and textural similarities to rocks of that suite and limited Rb-Sr data (for example, Bryant and Hedge, 1978). However, U-Pb zircon date is 1,442±2 Ma (Aleinikoff and others, 1993a), confirming emplacement with Middle Proterozoic Berthoud Plutonic Suite of Tweto (1987)

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: Granodiorite of Mount Evans batholith. Geology data: Macrostrat (CC BY 4.0), serving USGS and Colorado Geological Survey maps.

On the map since 1903

The USGS has mapped this ground since 1903. 27 historical sheets cover this crag's map point; the oldest is below.

Thumbnail of the 1903 USGS sheet covering Sawtooth Ridge, Mt. Bierstadt/Evans combo — **USGS 1:62500-scale Quadrangle for Georgetown, CO 1903** · U.S. Geological Survey · 1903 · 1:62,500 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, 1903 to 1983: USGS topoView.

In print since 1877

1877 Geologic Map of Colorado (Hayden), high-resolution scan · F. V. Hayden; scan by the Colorado Geological Survey · 1877

The whole-state sheet of the 1877 atlas, scanned at full resolution by the state survey and free to download.

Colorado Geological Survey (publication HM-01-04) · Public domain · read it
Geological and geographical atlas of Colorado and portions of adjacent territory · F. V. Hayden, U.S. Geological and Geographical Survey of the Territories · 1877

The first geology anyone drew of this ground. Hayden's survey mapped the state in the 1870s; these are the sheets, with the rock units coloured as they understood them then.

Internet Archive (Brigham Young University copy) · Public domain · read it
Mountaineering in Colorado: the peaks about Estes Park · Frederick H. Chapin · 1889

The first book of Colorado climbing. Chapin's 1887-88 ascents of Longs Peak, Hallett, Ypsilon and the Mummy Range, with the approaches as they were before the park.

Internet Archive (Harvard University copy, Appalachian Mountain Club, Boston) · Public domain · read it
Trail and Timberline, volume 2 (1918) · Colorado Mountain Club · 1918

The Colorado Mountain Club's own magazine in its sixth year, with the club's outings and ascents as its members wrote them up at the time.

Internet Archive (Brigham Young University copy) · Public domain · read it
Mountaineering in the Rocky Mountain National Park · Roger W. Toll, U.S. National Park Service · 1919

The Park Service's own mountaineering guide, four years after the park was made. Peak by peak, with the routes of the day and the first recorded ascents Toll could find.

National Park Service, scan at the Internet Archive (Brigham Young University copy) · Public domain · read it

Free to read: public domain or government work. About Alpine Rock as a whole, not this wall. More in the reading room.

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.

Mount Evans Scenic Byway and Rogers Peak seen from Mount Blue Sky, Colorado, US · Clyde Charles Brown · 2024 · 715 m from the crag's map point
Wikimedia Commons · CC BY-SA · the record · placed by its coordinates

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