Geologists’ Association fieldtrip, north Somerset coast
May 23, 2020 @ 8:00 am - May 24, 2020 @ 5:00 pm
The field excursion will focus on magnificently exposed cliffs and the extensive foreshore between Blue Anchor Bay and Hinkley Point power station, north Somerset. This section provides some of the best outcrops of Triassic (Sherwood Sandstone and Mercia Mudstone Groups) to Lower Jurassic ‘Blue Lias’, including the transitional Penarth (‘Rhaetic’) Group recording one of the major marine transgressions of the rock record. It is also one of the best places anywhere to examine faults, fractures and compressional deformation, which in this area was responsible for uplifting the margin of a major Triassic rift basin – the Bristol Channel graben.
Favourable tides will allow plenty of time to examine the evidence for ancient depositional environments, tectonic structures, oil-related fluids, and a spectacular mud volcano. We should even be able to sneak in a cream tea.