Valmont Dike


Clickimageto enlarge.
Aerial view of the Valmont dike.

Clickimageto enlarge.
The Valmont dike just east of Boulder cuts the Pierre shale.

Click image to enlarge.
A thin-section of the Valmont dike. A slice of rock is mounted on glass and ground to 3/10,000th of an inch thick (thinner than a piece of paper). It is viewed under the microscope with polarized light.