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Radial Dikes 
 Radial dikes commonly radiate outward from a central igneous plug. A radial dike swarm is generally considered to be the roots of an eroded volcano. The body forces created within a symmetrical stratovolcano edifice set up the stress regime in which the radial dikes intrude outward from a central intrusive plug that feeds the overlying volcano.  Radial dike swarms have been mapped in Colorado about four miles east of Ouray, 18 miles northwest of Gunnison, 2.5 miles north of Del Norte, 15 miles west of Walsenburg, and 20 miles southwest of Walsenburg.

Map of the Summer Coon Volcano dikes.
Click image to enlarge.
Aerial photograph of the Summer Coon
radial dike swarm. Red arrows point
to the more prominent dikes.
Click image to enlarge.

  Summer Coon Volcano (32 Mya)
 Simulated view looking west across the San Luis Valley from Center, Colorado.

The image illustrates what the Summer Coon Volcano may have looked like 32 million years ago. The volcanic edifice probably covered about 70 square miles north of the town of Del Norte. Today, the stratovolcano has been mostly eroded away and all that is left are the radiating dikes and central plug that are the roots of the volcano.

Geologic map of radiating dikes at Silver Mountain. 
The red center is a plug and the red lines are dikes
radiating outward.
   View southward of Silver Mountain (foreground) and East and West
   Spanish Peaks. Black arrow points to the town of La Veta. Red arows
   highlight a few of the more than 500 dikes mapped in the area.
   Click on image to enlarge.
Silver Mountain

Last Updated: 10/17/2012 1:52 PM 
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