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67. Dalradian of Scotland (2009)


by Jack Treagus

The Dalradian of Scotland probably offers the greatest variety of metamorphic rocks to be found in the British Isles. Here we find sedimentary rocks originally ranging in composition from muds to sandstones and conglomerates as well as a wide range of calcareous rocks and volcanics.

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Table of Contents

Overview of Itineraries


Table of Contents


CONTENTS
PREFACE
ACKNOWLEDGEMENTS
LIST OF FIGURES

INTRODUCTION

GEOLOGICAL CONTEXT

LITHOSTRATIGRAPHY

STRUCTURE AND METAMORPHISM

TRAVEL, ACCOMMODATION AND ATTRACTIONS

TRAVERSE I THE SOUTHWEST HIGHLANDS

EXCURSION A. West side of Loch Lomond EXCURSION B. East shore of Loch Lomond
EXCURSION C. Crianlarich to Tyndrum
EXCURSION D. Glen Orchy
EXCURSION E. Moor of Rannoch and Glen Coe
EXCURSION F. Cuil Bay
EXCURSION G. Onich shore
EXCURSION H. Loch Leven and the River Leven
EXCURSION J. Benderloch
EXCURSION K. Kerrera

TRAVERSE II THE CENTRAL HIGHLANDS

EXCURSION L. Little Glen Shee to Rotmell
EXCURSION M. Ben Lawers and Glen Lyon
EXCURSION N. The Loch Tay Fault Zone
EXCURSION P. The Schiehallion area
EXCURSION Q. Glen Garry

TRAVERSE III THE BANFF COAST

EXCURSION R. East of Cullen
EXCURSION S. Sandend Bay
EXCURSION T. West of Portsoy
EXCURSION U. Hythe and Boyne Bays
EXCURSION V. Whitehills
EXCURSION W. Boyndie Bay
EXCURSION X. Coast east of Macduff

GLOSSARY
BIBLIOGRAPHY


Itineraries
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The Dalradian of Scotland probably offers the greatest variety of metamorphic rocks to be found in the British Isles. Here we find sedimentary rocks originally ranging in composition from muds to sandstones and conglomerates as well as a wide range of calcareous rocks and volcanics.

TRAVERSE 1. THE SOUTHWEST HIGHLANDS

Excursion A: West side of Loch Lomond to Crianlarich
A drive along the A82 road north from Luss, traversing the Southern Highlands Group of the Tay Nappe. The exposures of metamorphosed silts, muds and greywackes are close to the roadside and road cuttings. 6 localities listed.
Start point 11 km north of Helensborough NS 358 907

Excursion B: Along the east shore of Loch Lomond.
Traversing the Highland Boundary Fault Zone. 3 localities by foot and a further 2 by a short drive.
Start point the pier at Balmaha NS 416 909

Excursion C: Crianlarich to Tyndrum
Crossing the inverted strata from the Southern Highlands Group to the Argyl Group. Includes examination of the Tyndrum Fault and mine. 4 localities listed.
Start Point car park on the A82 NN 344 293

Excursion D: Glen Orchy
Crossing the Ben Udlaidh Syncline with exposures of garnet-mica schists and quartzite down to psammites of the Grampian Group. 5 localities listed.
Start Point on the B8074 NN 242 318

Excursion E: Rannoch Moor and Glen Coe
Grampian Group psammites with mineralised quartz veins, and the volcanic cauldron subsidence of Glen Coe. 3 localities listed.
Start Point at a lay-by on the A82 NN 306 456

Excursion F: Cuil Bay
Deformed slates, phyllites and psammites seen in exposures along the shore. 4 localities listed.
Start Point at the village of Duror NM 991 550

Excursion G: Onich Shore
A walk along the shore with folded slates and quartzites. 5 localities listed.
Start Point at abandoned quarry on north side of road NN 049 611

Excursion H: Loch Leven and the River Leven
Folded schists and quartzites with evident cleavage. 8 localities listed.
Start Point car park at North Ballachulish village NN 050 611

Excursion J: The west coast of Argyl; Benderloch, Kerrera and the Pass of Brander
Lower Devonian conglomerates and sandstones unconformably on the Dalradian. 2 localities listed.
Start Point at a lay by on the A828 at Polanach NM 937 502

Excursion K: Kerrera, Connel Bridge to Tyndrum via the Pass of Brander
The sub-Dalradian unconformity between the Easdale Slates and the Devonian conglomerates.
Start Point parking area north of Gallanach NM 835 283

TRAVERSE II. THE CENTRAL HIGHLANDS

Excursion L: Glen Shee to Rotmell
Crossing the inverted limb of the Tay Nappe and the ‘Flat Belt’ in the Tay Valley. 5 localities listed.
Start Point just after a ford on a minor road NN 988 340

Excursion M: Ben Lawers and Glen Lyon
The inverted greywackes and schists of the Southern Highland Group overlain by the Loch Tay Limestone and the schists of the Argyll Group. 9 localities listed.
Start Point in the National Trust car park NN 610 380

Excursion N: The Loch Tay Fault zone
Fault gouge and slickensides. 5 localities listed.
Start Point up the track from Glenlyon House NN 736 486

Excursion P: The Schiehallion area
Explores the metamorphic rocks in downward stratigraphic succession from the Schiehallion Quartzites of the Islay Subroup to the Grampian Group. Arranged as six sub-excursions:
Strath Fionan south side; Strath Fionan north side; Mid Strath Fionan; Lochan an Daimh;
Tempar Burn; Boundary Slide Zone.
Start Point in Forestry Commission car park NN 753 557

Excursion Q: Glen Garry
The complex double folding of severely deformed metamorphics. 10 localities listed.
Start Point car park on the old A9 NN 821 660

TRAVERSE III. THE BANFF COAST

Excursion R: East of Cullen
Coastal section of quartzite and folded psammites. 3 localities listed.
Start Point at NJ 520 678, with parking at Seatown NJ 505 673

Excursion S: Sandend Bay
Covering the transition from the Garron Point Formation to the Sandend Limestone Formation. 3 localities listed.
Start Point at Garron Point NJ 555 670

Excursion T: West of Portsoy
Durnhill Quartzite, Portsoy Formation to gabbro intrusion and Cowhythe Gneiss. 5 localities listed.
Start Point in car park at Portsoy NJ 583 664

Excursion U: Hythe and Boyne Bays
Cowhythe Gneiss and Boyne Limestone Formation. 2 localities listed.
Start Point on minor road to Boyne Bay Quarry NJ 614 653

Excursion V: Whitehills
The Whitehills Grit Formation. 1 locality listed.
Start Point on a minor road near the shore NJ 665 650

Excursion W: Boyndie Bay
The Boyndie Syncline with metamorphosed greywacke. 3 localities listed.
Start Point at a parking area NJ 677 645

Excursion X: Coast east of Macduff
The Macduff Slate Formation on the flat limb of the Boyndie Syncline. 3 localities listed.
Start Point on Moray Street, Macduff NJ 712 646

Map of Itineraries