1. Layer Thickness and Map Width
Width of a unit on the map is related to its true thickness… but they are not the same!
Why? Because of topography and dip.

3. Layer Thickness and Map Width
Thickness = distance between top and bottom surfaces of a layer measured perpendicular to those surfaces.
Map width = distance between top and bottom contacts measured perpendicular those lines.

4. Layer Thickness and Map Width
For vertical or horizontal beds, thickness can easily be measured from the map…
Vertical: thickness = map width.
Horizontal: thickness = elevation difference between upper and lower contact.
Thickness of dipping beds needs to be calculated with trig or using a cross-section…