Isopach maps display thickness. These contours connect points of equal thickness. This is commonly thickness of a rock unit, measures the stratigraphic thickness as opposed to vertical thickness.
The above image is an Isopach map that was constructed by a petroleum geologist over a small gas field. The square sections are one mile on each side and contour the thickness of an individual sandstone. This sandstone is about 45 feet thick in the middle (the hottest pink area), and thins to 20 feet or less around the edges of the gas field.
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