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.
East Quantoxhead Fault
Somerset, UK
Sea cliffs (~ 20 m high) and wave-cut platform between East Quantoxhead and Blue Ben, ~ 18.3 km WNW of Bridgwater. Liassic (top Triassic and Lower Jurassic) limestones and shales are displaced by the East Quantoxhead Fault, which has a net normal displacement of ~ 50 m down to the south. Folding and thrusting in the hanging-wall indicated that the fault was partly "inverted", probably during Alpine contraction (Tertiary). Gentler folding also occurs in the footwall.
See Dart, C.J., McClay, K., Hollings, P.N., 1995. 3D analysis of inverted extensional fault systems, southern Bristol Channel basin, U.K. In Buchanan, J.G., Buchanan, P.G. (eds.) Basin Inversion. Geological Society, London, Special Publications 88, 393-413.
Lat: 51°11'17.9055"N
Long: 3°14'54.0451"W
Virtual Outcrop by David Peacock at University of Bergen. Contact David (david.peacock@uib.no) for georectified data, alternate formats or UAV images of outcrop.