STS-108 Earth Sciences and Image Analysis Debriefing with Crewmembers
January 23, 2001

VOLCANOES AND MOUNTAIN BUILDING
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STS108-720-32
photo ID STS108-720-32
STS108-720-32         Click the photo number to access all resolutions available and the database record.
Colorado, United States: Spanish Peaks and Rocky Mts. Uplift of the Sangre de Cristo range of the Rockies began about 75 million years ago and produced the long north-trending ridges of faulted and folded rock to the west of the paired peaks. After uplift had ceased (~26 to 22 million years ago), the large masses of igneous rock (granite "stocks") that form the Peaks were emplaced. Dikes radiate outward from the mountains like spokes of a wheel. As the molten rock rose, it forced its way into vertical cracks and joints in the bedrock; the less resistant material was then eroded away, leaving walls of hard rock.

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