UK. Dorset Coast Geology: at Stair Hole, the rocks have been forced up & contorted into the Lulworth Crumples. Throughout the area surrounding the cove there are excellent examples of exposures of folded Jurassic/ Cretaceous rock strata, providing a continuous record of about 80 Ma of the Earth's past geography & climates
Geological folding involves the plastic deformation (bending, buckling) of a single or multiple strata, such as sediments and rocks, which were originally horizontal surfaces. Although even brittle rocks may undergo plastic deformation when stresses are applied over considerable periods of time (low strain rate). Beyond plastic deformation, rocks fail structurally and faulting occurs.