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32. Isle of Arran (1989) 2nd Edition
by W.S. McKerrow and F.B. Atkins

The large variety of igneous and sedimentary rocks to be seen on the excellent coastal and island exposures, perhaps excelling any other area in the world, is why the Isle of Arran is so popular with geologists. The guide has been written assuming a very basic knowledge of geology on the part of the reader. After an extensive introduction to the geology of Arran the six excursions are described together with geological sketch maps. Each excursion can be carried out in seven to eight hours with an indication of a suitable lunch stop!

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Table of Contents

Selected Itineraries


Table of Contents


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CONTENTS
PREFACE
ACKNOWLEDGEMENTS
LIST OF FIGURES
LIST OF TABLES

1 GEOLOGY OF THE YORKSHIRE COAST

1.1 Introduction
1.2 The structural framework
1.3 Stratigraphy, palaeogeography and environments
1.4 The industrial story

2 SEISMIC PROFILES

2.1 Map of seismic coverage in NE Yorkshire
2.2 Regional seismic profile Whitby to Barmston
2.3 The Peak Trough
2.4 Robin Hood’s Bay Dome
2.5 The Peak Trough and Cayton Bay faults
2.6 Flamborough Head Fault Zone

3 EXCURSIONS

Itinerary 1: Staithes to Port Mulgrave
Itinerary 2: Runswick Bay
Itinerary 3: Saltwick Bay to Whitby
Itinerary 4: Robin Hood’s Bay and Ravenscar
Itinerary 5: Cloughton Wyke to the Hundales
Itinerary 6: Burniston and Scalby bays
Itinerary 7: Egton Bridge to Grosmont
Itinerary 8: South Bay, Scarborough and Cornelian Bay
Itinerary 9: Cayton Bay, Yons Nab and Gristhorpe Bay
Itinerary 10: Betton Farm, East Ayton and Filey Brigg
Itinerary 11: Reighton Gap to Speeton Cliffs
Itinerary 12: Thornwick Bay and North Landing, Flamborough
Itinerary 13: Flamborough Head
Itinerary 14: South Landing to Sewerby
Itinerary 15: Langtoft, Foxholes and Staxton Hill
Itinerary 16: North Holderness: Barmston south to Mappleton
Itinerary 17: South Holderness: Withernsea and Dimlington

4 REFERENCES

INDEX


Selected intineraries


Summary

The large variety of igneous and sedimentary rocks to be seen on the excellent coastal and island exposures, perhaps excelling any other area in the world, is why the Isle of Arran is so popular with geologists. The guide has been written assuming a very basic knowledge of geology on the part of the reader. After an extensive introduction to the geology of Arran the six excursions are described together with geological sketch maps. Each excursion can be carried out in seven to eight hours with an indication of a suitable lunch stop!

Itinerary 1 Glen Rosa
To examine the Stratheden Group (Old Red Sandstone (ORS)), then the contact with the Garvock Group (Lower ORS), metamorphism in the Lower Devonian and Dalradian, then Pleistocene and current geological processes and finally the Northern Granite.
Start Point First Bridge in Glen Shurig NS 001 369

Itinerary 2 Corrie, Sannox and North Glen Sannox
To examine the carboniferous on the shore at Corrie, alluvial sediments in ORS, Pleistocene and Holocene geomorphology, a modern gravel pit at mouth of Sannox Water, old barite workings, North Glen Sannox pillow lava with shales and greywackes and the contact between the Dalradian schists and the Northern Granites.
Start Point Twenty metres north of conspicuous conglomerate at NS 023 442 on Corrie shore road

Itinerary 3 North-East Arran
To examine the Loch Ranza (Dalradian) slates, the oldest rocks on Arran in the core of the Aberfoyle syncline, then the Carboniferous succession in the northern limb of the Glen Sannox anticline, the Permian New Red Sandstone (NRS) of northern Arran, the Dalradian turbidites, then Hutton’s Unconformity, Tertiary dykes and finally the land slipped coastline.
Start Point South Newton on Loch Ranza NR 934 511

Itinerary 4 The West Coast: Catcol to Blackwaterfoot
To examine the Dalradian / Northern Granite contact, fold structures in the Dalradian schists, a Carboniferous quartz dolerite dyke, the unconformity between the Stratheden Group and agate bearing Permian NRS, more NRS, and finally composite dykes and sills of Tertiary age.
Start Point Car Park South of Catcol NR 910 489

Itinerary 5 The Central Ring Complex
To examine Tertiary igneous rocks in the Central Ring Complex, then foundered blocks in the Central Ring Complex, Pleistocene river terraces and glacial landforms and finally a Tertiary acid sill.
Start Point On the String Road 500m north of Dereneneach NR 930 337

Itinerary 6 South-East Arran and Lamlash to Brodick
Wind and water deposited Permian sediments, Triassic lacustrine sediments (faulted and intruded), Tertiary sills and dykes with many internal features and metamorphic effects, storm beach, coastal lagoon, glacial erratics, then beach deposits of marine algal deposits.
Start Point At the road bridge on the A841 at Levencorroch NS 004 214