Geology Reference
In-Depth Information
Geo-inSight
Plutons
Intrusive bodies called plutons are common, but we see them
at the surface only after deep erosion. Notice that they vary in
geometry and their relationships to the country rock.
Cinder cone
Lava flow
Volcanic neck
Composite volcano
Volcanic pipe
Sill
Dike
2. Part of the Sierra Nevada batholith in
Yosemite National Park, California. The
batholith, consisting of multiple intrusions
of granitic rock, is more than 600 km long
and up to 110 km wide. To appreciate the
scale in this image, the waterfall has a
descent of 435 m.
Magma
Stock
Batholith
Laccolith
1. Block diagram showing various plutons. Some plutons cut across the
layering in country rock and are discordant, whereas others parallel the layering
and are concordant.
3. A volcanic neck in Monument Valley Tribal Park, Arizona.
This landform is 457 m high. Most of the original volcano
was eroded, leaving only this remnant.
4. Granitic rocks of
a small stock at
Castle Crags State
Park, California.
100
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