English: Black Canyon of the Gunnison National Park is a United States National Park located in western Colorado, USA. Taken by myself, Jesse Varner on 7/17/2005
https://www.flickr.com/photos/molas/27273359/ . This photo shows the "Painted Wall" cliff, which is about 670 metres high.
Dykes of light-coloured Vernal Mesa
pegmatite, about 1.43 billion years old, have
intruded into dark-coloured
gneiss, which is about 1.73 billion years old.
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