Isopach:
A contour that connects points of equal thickness. Commonly, the isopachs, or contours that make up an isopach map, display the stratigraphic thickness of a rock unit as opposed to the true vertical thickness. Isopachs are true stratigraphic thicknesses; i.e., perpendicular to bedding surfaces. Map of the areal extent and variation of a stratigraphic unit and used in geological exploration for oil and for underground structural analysis.
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