In three dimensions, thrust belts can be rather complex. Thrust sheets don't go on for ever but can form local stacks. Individual thrust surfaces can change stratigraphic level. Laterally restriucted culminations can be built up. To understand these structures in 3D, a critical issue if you want to understand how to project information onto cross-section planes, there are two approaches. The first of these is to describe the 3D geometry of individual thrust surfaces - using cut-off line maps. The second is to understand how thrusts relate to each other - using branch line maps. If you would like to see a real example of these approaches, visit the 3D Assynt site.
