to Palaeogene, and now juxtaposes Portland and Purbeck beds in the hanging wall against chalk in the footwall. The fault is not directly linked to faults beneath the Triassic salt layer. Weymouth Anticline The Weymouth Anticline has a west–to-east-trending axis and plunges to the east. Strata beneath the Upper Triassic halite are unfolded, indicating that the salt is acting as a decollement. The anticline is a result of inversion along the Abbotsbury–Ridgeway Fault, although it may have developed by the tightening of an earlier rollover anticline, formed during an earlier extensional phase, due to the soft-linked nature of the faulting. Purbeck Monocline This monoclinal structure forms part of a semicontinuous structure extending eastwards through the Isle of Wight as the Portland-Wight Monocline (or Disturbance). This was formed by reverse reactivation of the Purbeck–Isle of Wight fault zone. See also References Bibliography Dorset Jurassic Coast