Deep Cut Guide

Granitic rocks of 1400-m.y. age group

Granite. Mesoproterozoic, about 1,600 to 1,000 million years old. 143 crags on this site have their map point on it.

The map groups these named formations into this unit: Silver Plume Granite, Sherman Granite, Cripple Creek Granite, St. Kevin Granite, Vernal Mesa Granite, Curecanti Granite, Eolus Granite, Trimble Granite.

What the map says

Includes Silver Plume, Sherman, Cripple Creek, St. Kevin, Vernal Mesa, Curecanti, Eolus, and Trimble Granites or Quartz Monzonites; also, San Isabel Granite of Boyer (1962) and unnamed granitic rocks Lithology: alkali feldspar granite, granite, minor quartz monzonite.

1:500,000 sheet: Horton and others, 2017, U.S. Geological Survey Data Series 1052 (143 crags). A contact line at that scale is about 500 m wide on the ground.

Served by Macrostrat (CC BY 4.0). The wording is the map's own, quoted as a fact about the mapped unit, not about any one wall.

Independence Pass

South Platte

Gunnison

Alpine Rock

Durango

Leadville

CO Ice & Mixed

Grand Junction Area

Steamboat Springs

Every mapped unit with a crag on it.