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n.1.(Geol.) A mass of igneous rock intruded between sedimentary beds and resulting in a mammiform bulging of the overlying strata.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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There are two main coal basins, the larger Sobiecin and the smaller Gorce synclines separated by the Chelmiec magma intrusion (laccolite).
The intruded magmas chilled in slow way making planar and compact volcanic bodies (laccolites) without scoriaceus horizons whose alteration usually represents the first step of the volcanic soil formation.