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51. A Geological Field Guide to the Island of Bute, Scotland (1995)

by J. Hill & C. Buist

This guide, which has been written for the interested amateur (and to some extent, professional) geologist, has been planned in two parts, a general introductory section on the island’s geology and scenery, followed by a number of itineraries where interesting geological and topological features are displayed. Maps and drawings illustrate the text and assist in explaining some fundamental principles of geology.

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Table of Contents

Overview of Itineraries


Table of Contents


CONTENTS
LIST OF ILLUSTRATIONS
LIST OF PLATES
PREFACE
ACKNOWLEDGMENTS

INTRODUCTION: The Physical Framework

GEOLOGICAL HISTORY AND ROCK TYPES OF BUTE

ITINERARIES

Itinerary 1: Rothesay and Loch Fad
Itinerary 2: Scalpsie Bay
Itinerary 3: Bogany, Craigmore and Ascog
Itinerary 4: Kerrytonia to Bruchag Shore
Itinerary 5: Kilchattan to Glen Callum
Itinerary 6: Dunagoil Bay
Itinerary 7: Stravanan to Dunstrone
Itinerary 8: Balnakailly Bay
Itinerary 9: Ettrick Bay to Clate Point
Itinerary 10: Round Bute Trail

REFERENCES

PLATES


Itineraries
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Summary

This guide, which has been written for the interested amateur (and to some extent, professional) geologist, has been planned in two parts, a general introductory section on the island’s geology and scenery, followed by a number of itineraries where interesting geological and topological features are displayed. Maps and drawings illustrate the text and assist in explaining some fundamental principles of geology.

Itinerary 1 Rothesay and Loch Fad
This itinerary examines the line of the Highland Boundary Fault through Loch Fad and the unusual exposure of conglomerate by the eastern side of the loch.
Start point Natural History Museum, Stuart Street, Rothesay NS 088 645, or by driving to the triple junction near the Kirk Dam NS 079 627

Itinerary 2 Scalpsie Bay
The route explores the tantalising line of the Highland Boundary Fault; the relationship between the Old Red Sandstone (ORS) and the Dalradian schists; important glacial features and the unusual, problematical ‘Haystack’
Start point car park at the head of Scalpsie Bay, on the road (A844) between Ambrismore and Scalpsie Farms NS 060 587

Itinerary 3 Bogany, Craigmore and Ascog
The route traverses well exposed ORS and Carboniferous sedimentary rocks, Lower Carboniferous lavas and a suite of Permo-Carboniferous and Tertiary dykes.
Start point Battery Place, Rothesay opposite the Glenburn Hotel NS 095 652

Itinerary 4 Kerrytonlia oo Bruchag Shore
The shore route traverses Upper Red Sandstones with good sedimentary features and a suite of Carboniferous and Tertiary dykes
Start point Little Kilchattan Cottage NS 102 568

Itinerary 5 Kilchattan Bay to Glen Callum
The itinerary covers a wealth of geological phenomena from the famous and rare columnar sandstone of Kilchattan to geological important intrusions at Hawk’s Nib and Glen Callum.
Start point the end of the road through Kilchattan Bay, by a gate NS 108 545.

Itinerary 6 Dunagoil Bay
One of the best coastal sections in ORS in Bute, a varied group of Carboniferous igneous features, displayed along the raised beach.
Start point park in the lay-by opposite Dunagoil Farm NS 089 535

Itinerary 7 Stravanan to Dunstrone Shore
Start point Langalbuinoch Farm NS 083 567 and park down at the shore.

Itinerary 7a North Stravanan Shore
This itinerary has glacial erratics on the raised beach above ORS and Tertiary dykes in the ORS.
Start point NS 079 564

Itinerary 7b South Stravanan Shore to Dunstrone Fort
This itinerary has a succession of Old Red Sandstone intruded by a thick Carboniferous sill at Dunstrone Fort
Start point NS 080 559

Itinerary 8 Balnakailly Bay, North Bute
This itinerary has contortions in Dalradian schists, fossiliferous late-glacial clays and raised beaches, and magnificent views.
Start point Rhubodach Ferry Slip NS 027 743

Itinerary 9 Ettrick Bay to Clate Point
This itinerary has Dunoon phyllites, glacial erratics, dykes, Dalradian anticline.
Start point car park at Ettrick Bay NS 043 656

Itinerary 10 Round Bute Trail
This itinerary is designed for the motorist: viewing landscape associated with the Highland Boundary Fault and the Dalradian schists, in contrast with the igneous scenery of South Bute.
Start point Trail 1: 21 miles (34 km) Rothesay Pier NS 088 647; then Loch fad – Dunagoil - Kilchattan – Canada Hill - returning to Rothesay Pier
Start point Trail 2: 32 miles (51 km) Rothesay Pier NS 088 647; then Kyles – Ettrick Bay – Scalpsie – returning to Rothesay Pier

Map of Itineraries