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- Noun

A mass of igneous rock intruded between sedimentary beds and resulting in a mammiform bulging of the overlying strata.

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  • Laccolith


    A laccolith is a sheet-like intrusion (or concordant pluton ) that has been injected between layers of sedimentary rock. The pressure of the magma is high enough that the overlying strata are forced upward, giving the laccolith a dome or mushroom -like form (or possibly conical or wedge-shaped) with a generally planar base. Over time, erosion can form small hills and even mountains around a central peak. The development of laccoliths may take hundreds or thousands of years of related igneous activity as well as a very lengthy period to expose the intrusions at the surface.

  • Laccoliths

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