The geometrical properties of angular unconformities can be interpreted as follows:
1 Deposition of older beds;
2 Rotation of the layers to shallow, moderate, steep or overturned dips by folding and/or faulting;
3 Beveling of the upturned ends of such beds by erosion; and
4 Deposition of the younger beds.
Histories like this are commonplace within active continental margin setting