What are dikes, sills, and laccoliths?
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Dikes is a geological usage in a sheet of rock that formed in a fracture in a pre-existing rock body. http://en.wikipedia.org/wiki/Dike_%28geology%29 Sills is a tabular sheet intrusion that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock. http://en.wikipedia.org/wiki/Sill_%28geology%29 A laccolith is a sheet intrusion (or concordant pluton) that has been injected between two layers of sedimentary rock. The pressure of the magma is high enough that the overlaying strata are forced upward, giving the laccolith a dome or mushroom-like form with a generally planar base. http://en.wikipedia.org/wiki/Laccolith
thank you
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