The geology of Western Shetland

By W. Mykura and J. Phemister

(Front cover)

Contents

Title page and other preliminaries

Preface by the Director

List of illustrations

List of 6" maps

Chapter 1 Introduction

Location and Area, Physical Features, History of Research, Summary of Geology, References

Chapter 2 The Lunnister metamorphic rocks

Introduction, Banded Gneiss Group, Calcareous Group, Green Beds Assemblage, Clothister Hill Magnetite and Skarn, Western Unclassed Rocks, Structural Interpretation, References

Chapter 3 The Metamorphic rocks in the Muckle Roe-Northmaven Complex

Introduction, Lithology, Djubi Dale Enclave, Skipadock area, Egilsay, Busta Peninsula, Muckle Roe, Busta Isthmus, Petrography, Siliceous and Semipelitic Rocks, Pelitic Schists, Basic Rocks, Outlying Xenolithic Bodies of Basic Gneiss, Summary

Chapter 4 The Metamorphic rocks of the Walls Peninsula

Introduction, Lithology, Vementry Group, Neeans Group, West Burra Firth Group, Snarra Ness Group, Granite and Pegmatite Veins and Intrusions, Structure, : Geometry of Main Structural Elements, Main Phase of Folding, Phase of Intense Shearing, Kink Bands and Conjugate Kink Folds, Regional Tilting, Late NNW-trending Folds, NE to NNW-trending Faults and Associated Conjugate Folds, Metamorphic History, Possible deformation and mineral growth prior to main tectonizing metamorphism, Main Phase of Folding and Associated Metamorphic Episodes, Retrograde Metamorphism, Late Thermal Metamorphism, References

Chapter 5 Ve Skerries

Field Relationships, North Skerry, Ormal, The Clubb, Petrography, Granite-Gneiss, Foliated Granite, Schistose Rocks, References

Chapter 6 Metamorphic and intrusive rocks of Foula

Introduction, Metamorphic Rocks, Field Relationships, Petrography, Granitic Minor Intrusions, Petrography, Faults and Crush Belts, Reference

Chapter 7 Old Red Sandstone: Sandness Formation

Introduction, Junction between Sediments and Metamorphic Rocks, Sediments below the Clousta Volcanic Rocks, Basal Sediments, Sandstones and Conglomerates below Clousta Volcanic Rocks, Petrography, Conditions of Deposition, Clousta Volcanic Rocks and Associated Sediments, Area East of Brindister Voe, Area West of Brindister Voe, Flora, Petrography, Environment of Deposition, References

Chapter 8 Old Red Sandstone: Walls Formation

Introduction, Lithology, Coast between Wats Ness and Wester Sound, Vaila Sound and Vaila, Gruting Voe, Seli Voe, Scutta Voe and Voe of Browland, Area between Lunga Water and Walls Boundary Fault, Rea Wick-Roe Ness Peninsula, Sedimentary Enclaves within Sandsting Complex, Fauna and Flora, Petrography, Environment of Deposition, References

Chapter 9 Walls Sandstone: Structure

Structures attributed to the First Phase of Folding (F1), Structural Units of the Synclinorium, Northern Limb, Hinge Zone, Southern Limb, Structures attributed to Second Phase of Folding (F2), Comparison with other Areas of Late-Caledonian Folding, References

Chapter 10 Old Red Sandstone: Melby Formation

Introduction, Stratigraphy, Strata below Lower Melby Fish Bed, Lower Melby Fish Bed, Strata between Lower and Upper Melby Fish Beds, Upper Melby Fish Bed, Strata above Upper Melby Fish Bed Melby Rhyolites, Fauna, Petrography, Conditions of Deposition, Holm of Melby, References

Chapter 11 Middle Old Red Sandstone volcanic rocks and sediments of Papa Stour

Introduction, Basal & Lower Tuffs And Sandstones, Rhyolites And Inter-Rhyolitic Tuff, Structure, Geology Of Forewick Holm, References

Chapter 12 Old Red Sandstone of Foula

Introduction, Field Relationships, Conditions Of Imposition, Petrography, Structure, References

Chapter 13 The Northmaven-Muckle Roe Plutonic Complex

Introduction, Early Hypabyssal Intrusions, The Plutonic Complex, Field Relations, Ultrabasic Rocks, Diorite and Gabbro, Granites and Granophyre, Petrography, Ultrabasic Rocks, Gabbro and Diorite, The Larger Granite Masses, The Smaller Acid Bodies and Veins, Late Hydrothermal Activity, Field Relationships, Petrography, Evolution of the Igneous Complex, References

Chapter 14 Vementry Granite

Field Relationships, Petrography, Outer Granite, Inner Porphyritic Granite, Reference

Chapter 15 The Sandsting Granite-Diorite Complex

Introduction, Diorites and Associated Rocks, Granodiorite, Porphyritic Microadamellite and Associated Rocks, Granite, Granite Veining in shattered Sediment within Sandsting Complex, Late fine-grained Acid and Basic Intrusions, The Metamorphic Aureole, Scapolitized Crush Zones within the Sandsting Complex, Structure and Mode of Emplacement of the Complex, References

Chapter 16 Minor intrusions

Introduction, Basic and Intermediate Minor Intrusions: Field Relationships, Northmaven and Muckle Roe, Walls Peninsula and adjacent areas, Petrography, Basic Minor Intrusions, Dykes of Intermediate Composition, Acid Minor Intrusions, Field Relationships, Northmaven and Muckle Roe, North shore of Walls Peninsula and Adjacent Islands, Petrography, References

Chapter 17 Major transcurrent faults

Walls Boundary Fault, Outcrops of Fault, Tectonic History, Direction and Amount of Movement, Melby Fault, Conclusion, References

Chapter 18 Recent and Pleistocene

Mainland, Muckle Roe and Papa Stour, Introduction, Glacial Deposits, Interglacial Deposit, Evidence for Direction of Ice Flow, Corrie Glaciation, Glacial Retreat Phenomena, Periglacial and Post-Glacial Deposits, Peat, Post-Glacial Changes in Sea Level, Foula, References

Chapter 19 Economic geology

Clothister Hill Magnetite, Road Metal, Building Materials, Limestone, Peat, Ornamental and Semi-Precious Stones, References

Appendix. List of Geological Survey photographs

Figures, plates and tables

Hand specimen photographs from the BGS Systematic Series

British Geological Survey maps — Links to 1:63,360 and 1:10,560 maps