Tuesday 3rd January 2006
The periglacial Quaternary deposits
of Bideford Bay from Saunton to Westward Ho!
Field trip led by: Peter Keene and Chris Cornford
This will involve moderate
walking on wave cut platform -hard hats and visibility vests
will be provided
10.00 Meet Saunton Sands car park, Grid Ref. SS447376, High Tide
08.00 (5.97 metres)
The modern beach and dunes
are contrasted with the sandrock of the raised beach. This is
the steeply dipping
late Devonian/early Carboniferous Pilton beds (at an impressive
angular unconformity) and the overlying periglacial ‘head’ deposits.
Sedimentary structures within the carbonate-cemented sandrock tell
of shore-face processes also operating today, while unusual cast-like
features show dissolution-collapse and hydrogeological effects.
Glacial/interglacial cycling, global sea-level change and glacial
erratics will be discussed with reference to these spectacular
south facing cliff outcrops.
Pub lunch at ‘The Thatched Barn Inn’ at
Croyde (Tel:01271 890349)
14.00 Meet Westward Ho slipway car park, Grid Ref SS433295
Subject to winter storms
the ‘fossil forest’ and
associated glacial clays will be visited below the slipway at
Evidence of ice wedges (patterned ground) and frost-shattered pebbles
will be related to the peat beds and possibly the Neolithic midden
(Thor permitting). Some effects of long-shore drift and the high
(and differential) erosion rates on this part of the coast will
observed in the context of the development of the town. And finally,
the pebbly raised beaches to the west of Westward Ho! will be contrasted
with those of the morning outcrops.
Please contact Chris Cornford on 01237 471749
or 0777 378 8243 if unable to attend on the day
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