1. Cross-Sections
Depict units as they would appear in a vertical slice through the crust, like in a cliff exposure.
Cross-sections can be constructed by extrapolating information plotted on a geologic map (strikes-and-dips and locations of contacts with respect to topography).

2. Depicting Features in the Subsurface
Observe the three ways geologic features in the subsurface can be depicted (shown)
Block diagram
Infer the sequence of events that formed this area
INSTRUCTIONS TO STUDENTS
Observe the three ways geologic features in the subsurface can be shown
Infer the sequence of events that formed this area (described on next slide)
EXPLANATION
Block diagram: 3D depiction
Geologic cross section: slice through subsurface
Stratigraphic section: idealized sequence of layers
Stratigraphic section
Cross section
02.06.b1

3. Geologic Cross-Sections
2-dimensional vertical slice through a geologic map.
Start with a topographic profile.
Transfer contacts and structures onto topographic surface.
Project contacts and structures into subsurface.
Use field relations, mapping, and other constraints to infer possible subsurface geology.