Large Plutons
- Batholith:a very large (>40 sq.km) body that cuts across earlier rocks
- Stock: a smaller body (<40 sq. km) that cuts across earlier rocks that is the upper part of a batholith.
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Small Plutons
- Laccolith: a dome-shaped pluton that has a flat floor
- Sill: a tabular-shaped body that runs parallel to the rock layers
- Dike: a tabular-shaped body that cuts across rock layers
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Intrusive, or plutonic, igneous rocks form when magma cools slowly below the Earth's surface. Most intrusive rocks have large, well-formed crystals. Examples include granite, gabbro, and diorite.
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