Scottish Journal of GEOLOGY

Volume 12, Part 4, pages 271-338 1976

Published for the Geological Societies of Edinburgh and Glasgow by

SCOTTISH ACADEMIC PRESS

The Scottish Journal of Geology continues the Transactions of the Edinburgh Geological Society and the Transactions of the Geological Society of Glasgow, and is sponsored by the councils of the two Societies. It appears quarterly and contains four parts per volume. The Journal is sent to members of both societies. Details of membership may be obtained from the secretaries, whose names appear below.

Certain back numbers of the Trans. Edinb. geol. Soc. and the Trans, geol. Soc. Glasg. are still available. A list of prices and parts may be had on application to Scottish Academic Press Ltd., 33 Montgomery Street, Edinburgh, EH7 5JX

The Societies gratefully acknowledge financial help from the Carnegie Trust, Burmah Oil Trading Ltd., Robertson Research Company Ltd. and The Rio Tinto-Zinc Corporation Ltd. Con-tributions or legacies to assist towards the cost of publication of the Journal would be welcomed by the Editorial Board.

Editors B. J. BLUCK P. E. BROWN

D. J. FETTES R. MCQUILLIN

A. R. MACGREGOR DOUGLAS GRANT

Secretaries of Societies

EDINBURGH

NORMAN E. BUTCHER, ESQ., The Open University, 60 Melville Street, Edinburgh EH3 7HF

GLASGOW

J. G. MacDonald, c/o Geology Department, University of Glasgow G12 8QQ

Front Page Illustration

Coast of North Skye: from an engraving in MacCulloch's Western Islands of Scotland, Volume 3, (1820).

Copyright © Scottish Journal of Geology 1976 Reproduction of authors' summaries is authorised

Prices for non-members: Volume subscription £12.00—Single copies ,£3.50

Scottish Journal o GEOLOGY

Editors

C. D. GRIBBLE D. J. FETTES

A. R. MACGREGOR B. J. BLUCK

R. MCQUILLIN P. E. BROWN

DOUGLAS GRANT

Volume XII

1976

Published for the Geological Societies

of Edinburgh and Glasgow by

SCOTTISH ACADEMIC PRESS

The Scottish Journal of Geology is a Journal continuing and amalgamating the Transactions of the Edinburgh Geological Society and the Transactions of the Geological Society of Glasgow, and is sponsored by the councils of the two Societies. The Societies gratefully acknowledge financial help from the Carnegie Trust for the Universities of Scotland, Burmah Oil Trading Ltd., Robertson Research Company Ltd., and The Rio

Tinto-Zinc Corporation Ltd.

Copyright © 1976 Scottish Journal of Geology

Reproduction of authors' summaries is authorised Published by Scottish Academic Press Ltd., Edinburgh

Printed in Great Britain at Western Printing Services Ltd., Bristol Bound at W. H. Ware & Sons Ltd., Clevedon, Bristol

CONTENTS

VOLUME XII PART I (Published 14 May 1976)

ASHCROFT, w. A. and BOYD, R. The Belhelvie mafic igneous intrusion,

Aberdeenshire—a re-investigation . . . . . . . 1

TIPPER, J. C. The stratigraphy of the North Esk Inlier, Midlothian . . 15

MORTON, N. Bajocian (Jurassic) stratigraphy in Skye.Western Scotland . . 23

BARBER, A. j . and MAY, F. The history of the Western Lewisian in the Glenelg Inlier, Lochalsh, Northern Highlands 35

BECKINSALE, R. D., READING. H. G. and REX, D. c. Potassium-argon ages for basic dykes from East Finnmark: stratigraphical and structural impli-cations . . . . . . . . . . . 51

LAWSON, D. E. Sandstone-boulder conglomerates and a Torridonian cliffed shoreline between Gairloch and Stoer, Northwest Scotland . . 67

LETTERS

PATERSON, I. B., BROWNE, M. A. E., and ARMSTRONG, M. . . . . 89

LEEDER, M. R 90

VOLUME XII PART 2 (Published 26 July 1976)

FYFE, T. B. and WEIR, J. A. The Ettrick Valley Thrust and the upper limit of the Moffat Shales in Craigmichan Scaurs (Dumfries & Galloway Region: Annandale & Eskdale District) 93

HARMS, A. L., BRADBURY, H. j . , and MCGONIGAL, M. H. The evolution and

transport of the Tay Nappe . . . . . . . . 103

ELLIOTT, T. Sedimentary sequences from the Upper Limestone Group of Northumberland 115

TARLING, D. H., DONOVAN, R. N., ABOU-DEEB, j . M. and BATROUK, s. I. Palaeo-

magnetic dating of haematite genesis in Orcadian Basin sediments. . 125

MENDUM, J. A strain study of the Strathan Conglomerate, North Sutherland. 135

DARE-EDWARDS, A. j . and LIVESEY, N. T. Regolith development and modifi-cation on the Morven-Cabrach basic intrusion, Grampian Region. . 147

SMITH, R. A. and HARMS, A. L. The BaUachulish rocks of the Blair Atholl District. . . . . . . . . . . . 153

MOORHOUSE, s. j . The geochemistry of the Lewisian and Moinian of the Borgie area, North Sutherland 159

Notes for the guidance of authors submitting papers for publication in the Scottish Journal of Geology 167

CONTENTS

LETTERS

WHALLEY, W. B I 7 5

SISSONS, J. B I 7 8

PIASECKI, M. A. J. I 7 9

VOLUME XII Part 3 (Published 29 November 1976)

BROOKFIELD, M. E. The age of the Allt na Cuile Sandstones (Upper Jurassic,

Sutherland) 181

WINCHESTER, j . A. Different Moinian amphibolite suites in northern Ross-shire 187

TREWTN, NIGEL H. Correlation of the Achanarras and Sandwick Fish Beds, Middle Old Red Sandstone, Scotland. . . . . . . 205

POLLARD, j . E. and LOVELL, j . p. B. Trace Fossils from the Permo-Triassic of Arran. . . . . . . . . . . . 209

FETTES, D. j . , GRAHAM, c M., SASSI, F. p. and SCOLARI, A. The basal spacing of

potassic white micas and facies series variation across the Caledonides. . 227

RICHARDSON, s. w. and POWEIL, R. Thermal causes of Dalradian metamor-

phism in the central Highlands of Scotland. . . . . - 2 3 7

LETTER

TREAGUS, J. G 269

VOLUME XII PART 4 (Published 25 February 1977)

LAMBERT, R. ST. j . and MCKERROW, w. s. The Grampian Orogeny . . . 271

LIVINGSTONE, A. The paragenesis of spinel- and garnet-lherzolite in the

Rodel area, South Harris. . . . . . . . . 293

ROLFE, W. D. 1. Theses on Scottish geology 1973-5 3 0 1

HALL, J. and AL-HADDAD, F. M. Seismic velocities in the Lewisian meta-morphic complex, northwest Britain—'in situ' measurements. . . 3 0 5

RUSSELL, M. j . A possible Lower Permian for age the onset of ocean floor spreading in the northern North Atlantic. . . . . . 3 1 5

HENDERSON, p. and GIJBELS, R. Trace element indicators of the genesis of the

Rhum layered intrusion. . . . . . . . . 325

LETTERS TO THE EDITORS

WELSH, W. 335

HAYNES.'V. M 337