Transcript Devil`s Tower, Wyoming, a Volcanic Neck Volcanic Dike near Devil`s

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Intrusive igneous rock features come from
magma cooling underground.
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Includes:
 Dikes
 Sills
 Volcanic necks
 Batholiths
 http://www.youtube.com/watch?v=6loGYTCBVqo
Shiprock, New Mexico
Volcanic
Neck
Dike
http://www.wwnorton.com/college/geo/animations/volcanic_neck.htm
Devil’s Tower,
Wyoming, a
Volcanic Neck
Volcanic Dike
near Devil’s
Tower
Another
View of the
Volcanic
Dikes
Volcanic
Sill
Batholith
Yosemite Park,
California
Batholith
Yosemite Park,
California
Batholith
Yosemite Park,
California
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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.
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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).
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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.