<P> An anticline which plunges at both ends is termed a doubly plunging anticline, and may be formed from multiple deformations, or superposition of two sets of folds . It may also be related to the geometry of the underlying detachment fault and the varying amount of displacement along the surface of that detachment fault . </P> <P> An anticlinorium is a large anticline in which a series of minor anticlinal folds are superimposed . Examples include the Late Jurassic to Early Cretaceous Purcell Anticlinorium in British Columbia and the Blue Ridge anticlinorium of northern Virginia and Maryland in the Appalachians, or the Nittany Valley in central Pennsylvania . </P> <P> Anticlines are usually developed above thrust faults, so any small compression and motion within the inner crust can have large effects on the upper rock stratum . Stresses developed during mountain building or during other tectonic processes can similarly warp or bend bedding and foliation (or other planar features). The more the underlying fault is tectonically uplifted, the more the strata will be deformed and must adapt to new shapes . The shape formed will also be very dependent on the properties and cohesion of the different types of rock within each layer . </P> <P> During the formation of flexural - slip folds, the different rock layers form parallel - slip folds to accommodate for buckling . A good way to visualize how the multiple layers are manipulated, is to bend a deck of cards and to imagine each card as a layer of rock stratum . The amount of slip on each side of the anticline increases from the hinge to the inflection point . </P>

Anticlynes and synclines are the product of what type of tectonic force