Intrusive igneous rock features come from magma cooling underground. Includes:

Dikes Sills Volcanic necks Batholiths http://www.youtube.com/watch?v=6loGYTCBVqo

Shiprock, New Mexico

Dike

Volcanic Neck

http://www.wwnorton.com/college/geo/animations/volcanic_neck.htm

Devil’s Tower, Wyoming, a Volcanic Neck

Volcanic Dike near Devil’s Tower

Volcanic Dike near Devil’s Tower

Another View of the Volcanic Dikes

Another View of the Volcanic Dikes

Volcanic Sill

Yosemite Park,CaliforniaBatholith

Yosemite Park,CaliforniaBatholith

Yosemite Park,CaliforniaBatholith

The Fish Canyon eruption in southwestern Colorado about 28 million years ago erupted more than 5,000 km3 (3,107 miles3) of magma from the La Garita caldera. That is enough magma to bury the entire state of California to a depth of nearly 39 feet.

Colorado has at least nineteen calderas including one of the world’s largest, the La Garita Caldera. It is so large (22 by 47 miles) that for a long time it was hard for geologists to realize that they were mapping in a giant caldera.

The scale of La Garita volcanism was far beyond anything known in human history. The resulting deposit, known as the Fish Canyon Tuff, has a volume of approximately 5,000 cubic kilometers (1,200 cu mi), enough material to fill Lake Michigan (in comparison, the May 18, 1980 eruption of Mt. St. Helens was only 1.2 cubic kilometers (0.3 cu mi) in volume).

Crater Lake formed around 5,677 (± 150) BC when Mount Mazama exploded.

Crater Lake is the deepest lake in the Western Hemisphere and the third deepest in the world.

Its deepest point has been measured at 1,949 feet.