Scottish Journal

of GEOLOGY

Volume 19, Part 3, pages 271-414 1983

Published for the Geological Societies of Edinburgh and Glasgow by

S C O T T I S H A C A D E M I C 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 contains three 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 the 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 and the Kilwarlin Trust. Contributions or legacies to assist towards the cost of publication of the Journal would be welcomed by the Editorial Board.

Editors

E. N. K. CLARKSON N. G. T. FANNIN

I. MUNRO J. HALL

D. K. SMYTHE I. ALLISON

A. OWEN DOUGLAS GRANT

Secretaries oj Societies

EDINBURGH

R. A. SCRUTTON, Department of Geology University of Edinburgh

West Mains Road, Edinburgh EH9 3JW

GLASGOW

M. C. KEEN, c/o Geology Department

University of Glasgow, G12 8QQ

Front Page Illustration

Clydagnathus? cf. caviformis Rhodes, Austin and Druce. The first and only known specimen of an animal bearing con-odonts in situ, discovered in February 1982 X4.25. (Vide Briggs, D. E. G., Clarkson, E. N. K. and Aldridge, R. J. 1983 Lethaia, 16, 1-14). Head at left hand side. Lower Carboniferous "shrimp-band" in the Granton sand­

stones, Granton, Edinburgh.

Copyright © Scottish Journal of Geology 1983 Reproduction of authors' summaries is authorised

Prices for non-members: Volume subscription £40.00—Single copies £*S-oo

Scottish Journal of G E O L O G Y

Editors

E. N . K. CLARKSON D . K. SMYTHE

I. M U N R O NIGEL FANNIN

I. ALLISON ] . HALL

A. O W E N DOUGLAS G R A N T

Volume X I X

1983

Published for the Geological Societies

of Edinburgh and Glasgow by

S C O T T I S H A C A D E M I C PRESS

The Scottish Journal of Geology is a Journal continuing and amal­

gamating 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 and the Kilwarlin Trust .

Copyright © 1983 Scottish Journal of Geology

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

Printed in Northern Ireland at The Universities Press (Belfast) Ltd.

CONTENTS

V O L U M E XIX P A R T I (Published 21 March 1983)

SCHRAM, F. R. Lower Carboniferous biota of Glencartholm, Eskdale, D u m ­

friesshire i

LYLE, P. and THOMPSON, S. ). The classification and chemistry of the Tertiary

intermediate lavas of Northeas t I r e l a n d . . . . . . . . 17

SMITH, R. L.. STEARN, j . E. F. and PIPER, j . D. A. Palaeomagnetic studies of the

Torr idonian sediments , N W Scotland 29

ASTIN, T. R. and MacDONALD, D. I. M. Syn-depositional faulting and valley-fill

breccias in the Permo-Triass ic of Arran . . . . . . . 4.7

PARSONS, l a n d McKiRDY, A. p. Inter-relationship of igneous activity and thrust­

ing in Assynt: excavations at Loch Borralan 59

STOKER, M. s. Faulting and associated cataclasis in Eastern Ardgour . . 67

DiCKiN, A. V. and WHYTE, F. Hydro the rmal Sr exchange at the contact of the

D u m b a r t o n Rock basalt 81

MORTON, N. Palaeocurrents and palaeo-environment of part of the Bearreraig

Sandstone (Middle Jurassic) of Skye and Raasay, Inner Hebrides 87

RODDICK, j . c. and M A X , M. D. A Laxfordian age from the Inishtrahull Platform,

C o u n t y Donegal , Ireland 97

LETTERS TO THE EDITORS:

CRAIG, G. Y. and WALTON, E. K. Asymmetr ical folding in the Hawick Rocks of

the Gal loway area. Southern Uplands : C o m m e n t 103

STRINGER, P. and TREAGUS, J. E.—Reply 107

WEIR, |. A. Asymmetr ical folding in the Hawick Rocks of the Galloway area,

Southern Uplands : C o m m e n t . 113

STRINGER, P. and TREAGUS, J. E.—Reply 118

WHYTE, M. A. T h e Upper Brigantian (Lower Carboniferous) of Central Strathclyde—Reply 123

N I C H O L S O N , R. Age of the Camas Malag Format ion , Skye—Reply . 127

V O L U M E X I X P A R T II [Published 27 June 1983)

TINKLER, K. I. John Playfair on a glacial erratic in the Isle of Arran 129

WAGNER, R. H. A Lower Rotl iegend Flora f rom Ayrshire . . . . 135

D I X O N , j . and WILLIAMS, G. Reaction softening in mylonites from the Arnaboll

Thrus t 157

PICKERING, K. Small-scale synsedimentary faults in the U p p e r Jurassic Boulder

Beds of N E Scotland 169

WILSON, R. B. Note on the correlation of the Upper Limestone Group (Namurian) in south Ayrshire 183

LAGIOS, E. A gravity study of the eastern Berwickshire Devonian basins, SE

Scotland 189

PARNELL, j . The distribution of hydrocarbon minerals in the Orcadian basin 205

PARNELL, j . The Cothall Limestone 215

HARDING, R. R. Zr-rich pyroxenes and glauconitic minerals in the Tertiary alkali granite of Ailsa Craig 219

BROWNE. M. A. E., MCMILLAN, A. A. and GRAHAM, D. K. A late-Devensian Marine and Non-marine sequence near Dumbarton, Strathclyde . . . . 229

DICKIN, A. P. Hydrothermal fluid pathways at the contact of the Beinn an Dubhaich epigranite, Isle of Skye 235

ANDREWS, S. M. Altyre and Lethen Bar, two Middle Old Red Sandstone fish

localities? 243

LETTERS TO THE EDITORS:

ROBERTS, J. L. and TREAGUS, j . E. The structure of the SW Highlands . 265

LITHERLAND, M. Reply 268

VOLUME XIX PART III (Published 21 November 1983)

TYLER, i. M. and ASHWORTH, J. R. The metamorphic environment of the Foyers Granitic Complex 271

JACOB, A. W. B., NEILSON, G. and WARD, v. A seismic event near the Hebrides Terrace Seamount 287

STONE, P. and RUSHTON, A. W. A. Graptolite faunas from the Ballantrae

ophiolite complex and their structural implications 297

FLINN, DEREK Glacial meltwater channels in the northern isles of Shetland 311

BROWNE, M. A. E., MCMILLAN, A. A. and HALL, I. H. s. Blocks of marine clay in till near Helensburgh, Strathclyde 321

BROOK, M. and ROCK; N. M. s. Caledonian ages for pegmatites from the Glen Urquhart serpentinite-metamorphic complex, Inverness-shire . 327

PENN. I.E., HOLLIDAY, D. W., KIRBY, G. A., KUBALA, M., SOBEY, R. A., MITCHELL, W. I., HARRISON, R. K. and BECKINSALE, R. D. The Lame No. 2 Borehole: discovery of a new Permian volcanic centre 333

CAMPBELL. N. A. and PAUL, c. R. c. Pentameral fossils from the Lower Cambrian Pipe Rock of the North-West Highlands 347

GRAHAM, D. K. On the occurrence of the arctic marine bivalve Macoma torelli (Steenstrup) Jensen in the Errol Beds, east Scotland 355

GRAHAM, D. K. The distribution and stratigraphical significance of the marine bivalve Saxicavella jeffreysi Winckworth in the Quaternary deposits of Scotland 359

STOKER, M. S. The stratigraphy and structure of the Moine rocks of Eastern Ardgour 369

WEBB, B. Imbricate structure in the Ettrick area, Southern U p l a n d s . . . 387

LETTERS TO THE EDITORS:

PARNELL, j . The Summary volcanic 'neck', Hoy 401

ROBERTS, A. M. Tectonic sliding within the Moinian Loch Eil Division near Kinlocheil, W. Inverness-shire: Comment 404

STRACHAN, R. A. Reply . . . 407

ERRATA:

PICKERING, K. T. Small scale syn-sedimentary faults in the upper Jurassic 'Boulder Beds' 411

BROWNE, M. A. E., MCMILLAN, A. A. and GRAHAM, D. K. A late Devensian Marine and Non-Marine sequence near Dumbarton, Strathclyde . . . . 411

ANDREWS, s. M. Altyre and Lethen Bar, two Middle Old Red Sandstone fish localities? 411

INDEX . 412