1. What might be seen by slicing through a solid object, such as a slice through the earth. 2. A profile showing the geologic formations that would be exposed in a vertical cut, or some physical property of what would be so exposed. 3. A plot of seismic events, as a record section. 4. Geologic formation, as ‘‘the section in this area is Mesozoic.’’ 5. A square mile=640 acres. Section numbering is shown in Figure T-11.