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.
Monkstone Point
Pembrokeshire, SW Wales
Monkstone Point exposes deformed Carboniferous units in three naturally occurring cliff sections. The deformation here is complex: multiple deformation mechanisms can be observed in the cliff sections, including chevron folding, buckle folding, thrusting and thickening of units. Carboniferous siltstones, shales and coal horizons here appear to each have their own characteristic structural style. This suggests that the mechanical properties of these sedimentary units is important for defining how units deform.
The virtual outcrop below was used for a detailed structural study, published in the Journal of Structural Geology:
Cawood, A.J. and Bond, C.E., 2018. 3D mechanical stratigraphy of a deformed multi-layer: linking sedimentary architecture and strain partitioning. Journal of Structural Geology, 106, pp.54-69.
Lat: 51°41'48.8"N
Long: 4°40'41.8"W
