3-D Structural Geology
Exercise 4.5.4
Isopach Map
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Make an isopach map of the sandstone thicknesses on the map of Fig. 4.19. The thickest measurements form a trend that could be a channel or the limb of a monocline. If the thickness anomaly is due
to a dip change, what is the amount? If the thickness anomaly is due to paleotopography, what is the
maximum topographic slope?
Fig. 4.19. Map of thicknesses (in feet) in the John S sandstone
R. H. Groshong, 3-D Structural Geology, 2nd ed., © Springer-Verlag 2006