Norber erratic

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

Norber erratic

Yorkshire, UK

The Norber erratics are Silurian grit/Greywacke boulders placed on Carboniferous Limestone pavement, deposited by ice ~15kya ago, at the end of the Devensian glaciation. These erratics are a classic site for studying glacial deposition processes and limestone denudation rates.

Reference:

Goldie, H. (2005). Erratic judgements: re-evaluating solutional erosion rates of limestones using erratic-pedestal sites, including Norber, Yorkshire. Area, 37(4), pp.433-442.

The virtual outcrop was generated using Agisoft Photoscan from photographs acquired by Ross Langley.