Folding at Broadhaven
Pembrokeshire, SW Wales
One of The Geological Society's 100 Great Geosites. Asymmetric folds in interbedded Carboniferous siltstones, shales and coal horizons are cut here by a number of northward-propagating thrusts. This classic structure has been studied in some detail (e.g. Williams and Chapman,1983) as it provides an excellent outcrop example to examine the interplay between faulting and folding during deformation.
Trevayne
Pembrokeshire, SW Wales
Large-scale harmonic fold within Carboniferous siltstones, shales and coal horizons. Close inspection of the fold core reveals several low offset thrust segments which probably formed to accommodate the relatively tight interlimb angle here. The cross-section below shows the transition in structural style between this location, Monkstone Point and Saundersfoot.
Trevayne
Pembrokeshire, SW Wales
Large-scale harmonic fold within Carboniferous siltstones, shales and coal horizons. Close inspection of the fold core reveals several low offset thrust segments which probably formed to accommodate the relatively tight interlimb angle here. The cross-section below shows the transition in structural style between this location, Monkstone Point and Saundersfoot.
Folding at Bude
Cornwall, UK
Sea cliffs (up to ~ 25 m) high and wave-cut platform in the sandstones and shales of the Carboniferous, Bude Formation, ~ 680 m south of Bude Harbour and the "Whaleback". The beds show Variscan folds and related faults. Some folds are upright and others have gently-dipping hinge planes. Faults are common in the hinges. For a description of the folds see Sanderson (1979). The outcrop provides an excellent example to examine the interplay between faulting and folding during deformation.
Sanderson, D.J. 1979. The transition from upright to recumbent folding in the Variscan fold belt of southwest England: a model based on the kinematics of simple shear. Journal of Structural Geology 1, pp. 171-180.
Lat: 50°49'26.6122"N
Long: 4°33'29.4514"W
Virtual outcrops by David Peacock
Single Fault & Fold Structure, Bude
An upright angular anticline in sandstones and shales of the Carboniferous, Bude Formation, exposed in a sea cliff ~ 40 m high at Upton, ~ 1.5 km SW of Bude. Folding appears to be accommodated by extensional and contractional faults in sandstone beds on the hinge and southern limb.
Lat: 50°48'53.7449"N
Long: 4°33'23.7367"W