Allen, P. M., and Jackson, Audrey A. 1985. Geological excursions in the Harlech dome. Classical areas of British geology, British Geological Survey. (London: Her Majesty's Stationery Office.) British Geological Survey Natural Environment Research Council

Geological excursions in the Harlech Dome: classical areas of British geology

By P. M. Allen Audrey A. Jackson

Bibliographical reference: Allen, P. M., and Jackson, Audrey A. 1985. Geological excursions in the Harlech dome. Classical areas of British geology, British Geological Survey. (London: Her Majesty's Stationery Office.)

British Geological Survey Natural Environment Research Council

London Her Majesty's Stationery Office 1985 © Crown copyright 1985. First published 1985. ISBN 0 11 884285 4

Authors:

  • P. M. Allen, BSc, PhD British Geological Survey Windsor Court, Windsor Terrace Newcastle upon Tyne NE4 2HE
  • A. A. Jackson, BA, PhD British Geological Survey Keyworth Nottingham NG12 5GG

(Front cover)

(Rear cover)

(Map 1) Relief map of Harlech Dome area (inside front cover).

(Map 2) Geological map of Harlech Dome area (inside rear cover).

Notes

  • National Grid references, given in the form [SH 7140 2863] throughout, all lie within the 100-km square SH.
  • Numbers preceded by E refer to thin sections in the collections of the British Geological Survey.

Contents

1 Introduction

Stratigraphy

Geological history

Geological structure

Mineralisation

Quaternary

2 Geological excursions

1 Ffridd-bryn-coch

2 Barmouth

3 Clogau goldmine

4 Capel Hermon

5 Bryn-llin-fawr

6 Allt Lŵyd

7 Upper Afon Melau valley

8 Llandanwg

3 Geological notes on popular walks

9 Barmouth to Hafotty mines

10 Panorama Walk

11 Roman Steps (Bwlch Tyddiad)

12 Drovers' Road, Llanbedr to Bontddu

13 New Precipice Walk

14 Precipice Walk

15 Ty'n-ygroes to Gwynfynydd

16 Pont Dolgefeiliau to Gwynfynydd

17 Torrent Walk

4 The Harlech dome road circuit

References

Glossary

Preface

Every year hundreds of students of geology visit the Harlech dome. The only guide to this classical area of Cambrian geology has hitherto been a geological map at one inch to one mile published by C. A. Marley and T. S. Wilson in 1946. To meet the needs of these visitors, this book which supplements the recently published 1:50 000 Harlech geological sheet, provides detailed geological notes and large-scale maps of carefully selected excursions in the Harlech dome. In addition, geological notes are provided (and a glossary of terms) for some of the more popular walks in the area, with he hope that they can be used by anyone with an interest in geology.

G. M. Brown Director. British Geological Survey Keyworth, Nottingham NG12 5GG. 4 January 1985

References