Figure 7.15: The two types of dip-slip faults. In normal faults the hanging wall drops down
relative to the footwall. In reverse faults, the footwall drops down relative to the hanging
wall. ( 17 )
Figure 7.16: At Chief Mountain in Montana, stresses that raised up the Rocky Mountains
caused a block of ancient Precambrian crust to be thrust more than 80 kilometers (50
miles) over much younger Cretaceous rocks. The result is that the upper rocks at the
Lewis Overthrust are more than 1 billion years older than the lower rocks. ( 39 )