laccolith

A mass of igneous rock intruded between layers of sedimentary rock, resulting in uplift.

A name given by G. K. Gilbert to masses of lava which, when rising from below, have not found their way to the surface, but have spread out laterally, and formed a lenticular aggregation, thereby lifting the rocks above into dome-shaped forms.

a mass of igneous or volcanic rock found within strata which forces the overlaying strata upwards and forms domes.

mass similar to lopolith but concave up.