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71. The Coast of the Bristol Region: Quaternary Geology and Geomorphology (2013)

compiled by David J. Case

The Quaternary geology and geomorphology of the Bristol Region coastline has great importance as a record of, and analogue for, climate fluctuation and sea-level change. This guide covers five excursions between Oldbury Flats, c. 7 km north-east of the First Severn Road Bridge, to Lilstock, c. 12 km west of Burnham-on-Sea.

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Table of Contents

Overview of Itineraries


Table of Contents


PREFACE
ACKNOWLEDGEMENTS
LIST OF FIGURES
LIST OF TABLES

INTRODUCTION
Pre-Quaternary landforms
An introduction to the Quaternary
Timescales and frameworks
Quaternary history of the Bristol Region
Tidal range and relative heights of the Levels
Early people, settlement and land use
Introduction to the excursions

EXCURSION 1: Late Quaternary geology and geomorphology in the Severn Estuary, Aust-Northwick Warths and Oldbury Flats
Aust Warth, Cake Pill and Northwick Warth
Oldbury Flats

EXCURSION 2: Pleistocene glaciation and Holocene sea-level rise, the Gordano Valley
Gordano Valley Interfluves
Holocene sediments
Weston Moor
Clapton Moor

EXCURSION 3: Late Quaternary geology and geomorphology of the Middle Hope Headland and Sand Bay
Middle Hope Headland and Sand Bay

EXCURSION 4: Late Devensian geology and Holocene coastal development, Burnham-on-Sea to Brean Down
Berrow Beach to Berrow Church
Brean Sands Beach (south) to Unity Farm
Brean Sands Beach (north)
Brean Down Beach and Cliff
Burnham-on-Sea

EXCURSION 5: Holocene coastal change and geomorphology of the Lilstock to Stert coastline
Lilstock Bay
Hinkley Point to Wall Common
Wall Common to Stert Point

REFERENCES
GLOSSARY
INDEX


Itineraries
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The Quaternary geology and geomorphology of the Bristol Region coastline has great importance as a record of, and analogue for, climate fluctuation and sea-level change. This guide covers five excursions between Oldbury Flats, c. 7 km north-east of the First Severn Road Bridge, to Lilstock, c. 12 km west of Burnham-on-Sea.

Excursion 1 Aust-Northwick Warths, Oldbury Flats

John R.L. Allen
A day trip looking at Late Quaternary geology and geomorphology in the Severn Estuary, Aust-Northwick Warths and Oldbury Flats.
Start point Park on B4461 to WSW of Aust Village ST 563 887

Excursion 2 Gordano Valley

Ann Bridle, Tom Hill, Chris Spencer & Wendy Woodland
Pleistocene glaciation and Holocene sea-level rise, in the Gordano Valley.
Start point Mouth of Walton Valley, 3 km NE of Clevedon (M5 Junction 20) ST 423 737

Excursion 3 Middle Hope and Sand Bay

David J. Case
A circular walk, c. 6 km, looking at the Late Quaternary geology and geomorphology of the Middle Hope headland and Sand Bay.
Start point National Trust Car Park at North end of Beach Road, Sand Point ST 330 659


Excursion 4 Burnham-on-Sea to Brean Down

Chris Spencer
Late Devensian geology and Holocene coastal development, Burnham-on-Sea to Brean Down.
Start point Berrow Beach (ST 288 524), park off the B3140, close to St. Mary’s Church


Excursion 5 Lilstock to Stert coastline

David J. Case
Holocene coastal change and geomorphology of the Lilstock to Stert coastline, mostly within the Bridgwater Bay National Nature Reserve.
Start point Lilstock car park between village and beach (via A39 from Bridgwater) ST 172 453

Map of Itineraries