通常由等厚线(或等值线)构成等厚图，展示岩石单位的(与真垂直厚度相对的)地层厚度。
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.
等厚线是垂直于层理面的、真正的地层厚度。
Isopachs are true stratigraphic thicknesses; i. e., perpendicular to bedding surfaces.
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