Isopach maps are generally used to show rock thickness in certain regions or areas. The thickness of the rocks are shown by contour lines in various intervals according to the thickness of the rock. The isopach map above is showing the Cambrian system in North America where Cambrian rocks are most prevalent. The dotted areas of the map represents mostly sandstone areas, which is what covers the Cambrian rocks. When dealing with isopatch maps the main interest and trend of the map is to illustrate rock thickness in the area shown on the given map.
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