Laccolith

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laccolith

[′lak·ə‚lith]
(geology)
A body of igneous rock intruding into sedimentary rocks so that the overlying strata have been notably lifted by the force of intrusion.

Laccolith

 

mushroom-shaped (bun-shaped) mass of igneous rock formed when magma intrudes between layers of sedimentary rock; the layers of sedimentary rock are moved apart and raised in a domelike shape above the intrusion.