An Isopach Map is a map that depicts the various thicknesses within a single stratum. The term Isopach refers to the actual contour line that joins together areas of equal thickness. This particular map is of the Purbeck Formation in Southern England and the English Channel. This formation, thought interesting from a geological, should not be taken as just a natural phenomenon which we wish to explore. The map shows the variety in thickness of the rocks and cliffs surrounding the bay and is used to warn those who wish to live on the unsteady cliffs or traverse the sound of the dangers of such unsteady and diverse geological regions.
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