Geological Maps and Structures L5

Question 1

What is a true fold profile?

Answer 1

The shape of a fold seen on a section plane which is at right angles to the hinge line.

Question 2

What is a true profile/horizontal section?

Answer 2

The only section of a fold that shows its true geometry, indicating what the fold would look like in map view.

Question 3

The more ________ a section is to the ______ _________, the _________ the apparent fold.

Answer 3

The more oblique a section is to the true profile, the tighter the apparent fold.

Question 4

When viewing a map, how do you distinguish real folds from topographic effects?

Answer 4

Non-planar geologic contacts are curved even where topographic contours are relatively straight and equally spaced.

Planar geologic contacts are curved in map view only where topographic contours are also curved or unevenly spaced.