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Geological
structures
- Unconformity = a period
when no sediment was
deposited
- Angular conformity = the rocks above and
below the unconformity have different dips,
and possibly strikes
- Angular conformity = the rocks above and
below the unconformity have different dips,
and possibly strikes
- Joints
- A fracture in competent
rocks along which no
observable movement has
occurred
- Tectonic joints = form as a result of folding and
cause tension joints parallel to the axial plane and
cross joints on the limbs
- Cooling joints = form as a result of
contraction on cooling of igneous rocks
- Unloading joints = form as a result of lower pressure
near to the surface, they are often horizontal as well as
vertical
- A fracture in competent
rocks along which no
observable movement has
occurred
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