Rushton, A.W.A., Owen, A.W., Owens, R.M. & Prigmore, J.K. 2000. British Cambrian to Ordovician Stratigraphy. Geological Conservation Review Series No. 18, JNCC, Peterborough, ISBN 1 86107 4727. The original source material for these web pages has been made available by the JNCC under the Open Government Licence 3.0. Full details in the JNCC Open Data Policy

British Cambrian to Ordovician stratigraphy

Contents

Title page and preliminaries

The Authors

Acknowledgements

Access to the countryside

Preface

1 General introduction A.W.A. Rushton

Introduction

Scope

Overview

Palaeogeography

The significance of fossils

2 Introduction to Cambrian stratigraphy A.WA. Rushton

History

Distribution

Boundaries of the Cambrian System

Divisions of the Cambrian

3 Cambrian of North Wales A.W.A. Rushton and I.K. Prigmore

Harlech Dome

Barmouth Hillside

Trwyn Carreg-y-tir

Porth Ceiriad

Afon Llafar

Nant y Graean and Nant Ganol

Rhobell-y-big and Foel Gron

Ogof Ddû (Rhiw-for-fawr)

Arfon area

Llyn Padarn

Moel Tryfan

Cwm Graianog

4 Cambrian of South Wales: St David's area J.K. Prigmore and A.W.A. Rushton

Introduction

St Non's Bay and Caerfai Bay

Trwyncynddeiriog

Porth-y-rhaw

Dwrhyd Pit

SoIva Harbour

Treffgarne Bridge

5 Cambrian rocks of England A.W.A. Rushton

Introduction

Ercall Quarry

Comley Quarry

Gullet Pass Pit

Boon's Quarry

Woodlands Quarry

Illing's Trenches, Hartshill Hayes

Mancetter Quarries

Charnwood Forest area, English Midlands

Stable Pit, Bradgate Park

The Brand

6 Introduction to Ordovician stratigraphy A.W.A. Rushton

History

Distribution

Boundaries of the Ordovician System

Divisions of the British Ordovician

7 Tremadoc Series in Wales and England J. K. Prigmore, A.W.A. Rushton and R.M. Owens

Introduction

Wales

Bryn-llin-fawr

Dol-cyn-afon

Tyn-llan

Pen Benar

Wern Road

Amnodd-bwll

Y Garth

Cwm Crymlyn

England

Cherme's Dingle

Sheinton Brook

Coundmoor Brook, Evenwood

Granham's Moor and Eastridge Wood, and Linley Big Wood

River Calder, Latter Barrow

8 Arenig to Ashgill in South Wales R.M. Owens

Introduction

Ogof Hên and Road Uchaf

Dan-lan-y-castell

Glan Pibwr

Allt Pen-y-Coed

Cwm yr Abbey

Pwlluog (Whitesand Bay)

Pontyfenni, Whitland

Llanfallteg Cutting

Abergwaun (Fishguard Old Harbour)

Ffairfâch Railway Cutting and Afon Cennen

Dynevor Park

Talar Wen

Meidrim Road section

Bryn-banc Quarry, Llan-mill

Mylet Road

Sholeshook

Robeston Wathen

Crûg Farm

Birdshill Quarry

Builth–Llandrindod Inlier

Howey Brook

Newmead

Bach-y-graig

Llanfawr Quarry

Gwern yfed fâch, Builth Road

9 Arenig to Ashgill of North Wales R.M. Owens, A.W. Owen and A.WA. Rushton

Introduction

Bryn Glas Quarry

Hafotty Ffilltirgerig and Amnodd-wên

Trwyn-llêch-y-doll

Wîg

Nant y Gadwen

Afon Seiont

Llynnau Cregennen

Treiorwerth and Ty-hên

Nantannog Ravine

The Gynfor outliers

Fferam-uchaf

Trilobite Dingle

Nant Aberderfel

Gelli-grîn

Cadnant Cutting

Gwern-y-Brain

Cynwyd

Rhiwlas

Deganwy Quarries

Cwm Hirnant

10 Arenig to Caradoc of Shropshire A.W. Owen, R.M. Owens and A.W.A. Rushton

Introduction

Shelve area

Mytton Dingle and Snailbeach

Bergam Quarry

Shelve Church

Hope Valley

Betton Dingle

Meadowtown Quarry

Spywood and Aldress dingles

Caradoc area

Coston Farm

Coundmoor Brook, Harnage

Hope Bowdler Road Section

Soudley Quarry

Marshwood

Onny River

11 Arenig to Ashgill of northern England A.W. Owen and A.W.A.Rushton

Introduction

Main Outcrop: Skiddaw Group

Trusmadoor

Blaze Bridge and Scawgill Quarry

Barf

Randel Crag

Outerside

Main Outcrop: Dent Group

Stile End

Ashgill Quarry

Cross Fell Inlier

Harthwaite Sike

Pus Gill

Melmerby Road

Swindale Beck

Keisley Quarry

Cautley inliers

Sally Beck and River Rawthey

Backside Beck

Ecker Secker Beck

12 Scotland: Cambrian and Ordovician of the Hebridean Terrane J.K Prigmore and A.W.A. Rushton

Introduction

Durness and Balnakeil

An t-Sròn

Fuaran Mor

Loch Awe Quarry

Ord

13 Scotland: Cambrian and Ordovician of the Grampian Terrane and Highland Border Sub-terrane A.W.A. Rushton and A.W. Owen

Introduction

Leny Quarry

Lime Craig Quarry

14 Scotland: Ordovician of the Midland Valley Terrane A.W. Owen and A.W.A. Rushton

Introduction

Balcreuchan Port–Bennane Head

Aldons Quarry

Laggan Burn

Girvan foreshore

Craighead Quarry

South Threave

15 Scotland: Ordovician of the Southern Uplands Terrane A.W.A. Rushton and A.W. Owen

Introduction

Raven Gill

Corsewall Point

Morroch Bay and Port of Spittal Bay

Glenkiln Burn

Dob's Linn

References

Glossary

Fossil index

General index

Figures and tables

Tables