Field Excursions – Thursday 5th January
The Ussher Society 50th Anniversary Conference
Royal Beacon Hotel, Exmouth, Devon, 3-5th January 2012
Please note that, for insurance purposes, it is essential that you book your place on the field excursion using the conference booking form. All participants require appropriate footwear and clothing for early January fieldwork and a hard hat (available on the day). Due to the possibility of adverse weather / sea conditions, field excursion details will be confirmed at the conference on Wednesday 4th January.
Excursion 1: Triassic, Jurassic and Cretaceous of the East Devon Coast
Leader: Ramues Gallois
Purpose: To examine the transition from the terrestrial environments of the latest Triassic to the marine environments of the early Jurassic. The walk also includes the most accessible sections in the Upper Greensand in Devon, and traverses the spectacular 1839 Bindon Landslip. Continuous cliffs on the first part of the walk expose red and green mudstones that pass up into grey mudstones and white limestones, a succession of lithologies that represents the late Triassic change from hot desert to brackish marine environments. The later part of the walk includes foreshore exposures in fossiliferous marine Jurassic mudstones and limestones, and large collapsed masses of marine Cretaceous sandstones, calcarenites and Chalk within the western part of the 7 km-long Undercliffs Landslide NNR. The final part provides views of the well-documented Bindon Landslip and the extensive Eocene planation surface of East Devon.
Meeting point / practicalities: The complete excursion is about 7 km long, the first half along the beach (including some boulders). The return is along the coastal footpath. Assemble at 10 am at Seaton Bridge. There are roadside car parking spaces 100 m north of the bridge [SY 2535 9012] alongside the B3172 and in the nearby streets in Seaton. There are toilets at Seaton adjacent to the bus station, but none on the walk. Picnic lunch will be taken on the beach. The aim will be to return to the cars at about 4 pm. An alternative return route will allow those who have a long journey to get back by 3 pm.
Excursion 2: Igneous and sedimentary rocks of the Crediton Trough
Leaders: Sarita McVicar Wright and Richard Scrivener
Purpose: This excursion will visit localities selected to demonstrate the continental sandstones and breccias of the various Permian formations, also examples of basalt, lamprophyric lava and rhyolite of the Exeter Volcanic rocks. Possible locations include: West Sandford (Bow Breccia and Knowle Sandstone), Knowle Hill Quarry (lamprophyric lava), Uton Quarry (alkali basalt), Neopardy (rhyolite), Newton St Cyres (Crediton Breccia) and Cromwell’s Cutting (Newton St Cyres Breccia)
Meeting point / practicalities: The meeting place will be the main car park at Crediton Station at 9.30 am (Barnstaple side). There will be a lunch stop at the Lamb Inn, Sandford.
Please note that this excursion will be limited to 25 participants.
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