An Isopach is a line on a map of the Earth's surface connecting points where a rock stratum has equal thickness. There for an Isopach map is one in which lines or different shading is used to display areas where the stratum is of equal thickness. This is an Isopach map that is showing the areas off of the coast of the Pacific Ocean. The areas, in which the shading is the same, are areas where the stratum is equivalent.
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