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Geology LibreTexts

12: Geological Structures (Exercises)

Q12.1 Folding style

In order to help with the interpretation, one of the beds has been traced (in yellow) on the diagram below, and two of the fold axes have been shown (in pink). These folds are symmetrical, and although they are tight they are not isoclinal. They are overturned.

Folded rocks (in yellow) and fold axes (pink) [SE]

Q12.2 Types of faults

Top left: a normal fault, implying extension Top right: A reverse fault, compression
Bottom left: a series of normal faults, extension Bottom right: a right lateral fault (implies that there is shearing, but it is not possible to say if there is extension or compression)

Q12.3 Putting strike and dip on a map

See map below for strike and dip symbols. Relative ages, from youngest to oldest:

  • dyke (youngest)
  • fault
  • layer g (although this layer isn’t intersected by the fault or the dyke so it is not possible to know that it is older based on the information available)
  • layer f
  • layer e
  • layer d
  • layer c
  • layer b
  • layer a (oldest)

Vertical cross section (above), map view (below) [SE]