Along with all other members of the isoline type of map, isopachs are represented with lines representing equal thickness of rock with closer lines representing a sudden change in thickness and further apart lines meaning smoother thickness increases or decreases. This map in particular shows the thickness of rock around the Purbeck Formation of southern England and the English Channel. As shown on the map, the thickest rock is found around Weald Basin, and has a dramatic increase in thickness as shown by the closeness of the lines.
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