Dictionary:Magnetic basement

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{{#category_index:M|magnetic basement}} The upper surface of extensive heterogeneous crystalline rocks having magnetic susceptibilities that are large compared with those of sediments. Often but not necessarily coincident with the geologic basement (q.v.). Generally excludes magnetic sediments, thin volcanic and other high-susceptibility rocks intruded into the sedimentary section, but thick volcanic rocks in the sedimentary section might be classed as magnetic basement where the magnetic effects of deeper bodies would not be resolvable.