The geology of the Fannich mountains and the country around upper Loch Maree and Strath Broom : explanation of sheet 92

Benjamin Neeve Peach, L. W Hinxman

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• Publié par: les_archives_du_savoir
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• Langue: English
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Coleman
Library
ofDepartment Science*Geological
ofUniversity TorontoHOIRS OF THE GEOLOGICAL SURVEY,
SCOTLAND.F92
THE GEOLOGY
OF THE
FANNICH MOUNTAINS
AND THE
COUNTRY AROUND UPPER LOCH MAREE
AND STRATH BROOM.
(EXPLANATION OF SHEET 92.)
BY
B. K J.F.R.S. F.R.S.PEACH, LL.D., ; HORNE, LL.D., ;
THE LATE W. GUNN C. T. F.G.S.; CLOUGH, M.A., ;
AND E. F.G.S.GREENLY,
WITH CONTRIBUTIONS BY
L. W. F.R.S.E. T. I. M.A.HINXMAN, B.A., ; POCOCK, ;
AND C. B. C.M.CRAMPTON, M.B.,
AND
PETROLOGICAL NOTES
BY
J. J. H. F.R.S.TEALL, D.Sc., LL.D.,
ORDER OF THE LORDS OF HIS MAJESTY S TREASURY.PUBLISHED BY COMMISSIONERS
EDINBURGH :
FOR HIS MAJESTY'S STATIONERY OFFICEPRINTED
BY MORRISON & GIBB LIMITED
AT TANFIELD.
And to ba frompurchased
E. 13 & 14 LONG LONDON12, ACRE, ;STANFORD,
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FIGGIS & 104 GRAFTON DUBLIN.CO., STREET,HODGES,
From for the sale ofOrdnanceany Agent Survey Maps.
1 ADELPHIOr from T. FISHERBookseller, UNWIN, TERRACE,through any
who is the sole Wholesale to the Trade outside theLONDON, W.C., Agent
of London.County
1913.
Two andPrice Shillings Sixpence.PREFACE.
Tins Memoir describes the of the area included in Sheet 02geology
of the one-inch of Scotland. It the mountainousmap comprises
the of Loch Maree and north-ground bounding upper part extending
to Gruinard and thewards head of Loch the FannichBroom,Bay
mountains in the south-east and that of the mainquadrant, part
watershed of the situated to the east of Strath Broom.Highlands
This elevated forms of the of butregion part county Eoss, formerly
it contained small of the ofoutlying portions county Croinarty.
The belt of due to the movementscomplication post-Cambrian
crosses the from Loch Broom tosheet the alluvial at the headplain
of Loch Maree. To the west of this belt lie tracts of Lewisianlarge
Gneiss and Torridon Sandstone overlain theunconformably by
Cambrian formation. To the east there is a of thegreat development
Eastern which rise to some of the wildest inSchists, give scenery
In theCentral lloss-shire. north-west corner of the there is amap
small of Triassic and Liassic let down thestrata,patch against
Torridon Sandstone a fault.by large
The Sheet was B. N. J. thesurveyed geologically by Peach, Home,
late W. C. T. L. W. H. M. E.Gunn, Cadell,dough, Hinxman, Greenly,
C. TheT. I. and B. was done thePocock, Crampton. largest part by
whose area extended from thelate Mr. Fionn Loch north toGuim,
Gruinard thence eastwards An Strath andBay, by Teallach, Beg,
Strath Broom to Beinn and southwards to the watershed ofDearg,
the Fannich mountains. Messrs. Peach and Home took in thepart
ofof the belt due to themapping complication post-Cambrian
from Strath na tomovements the southern of theSheallag margin
Sheet. Dr. Peach also the Eastern Schists around Fionnsurveyed
and Dr. Home the of these rocksBheinn, development along
the southern of the Fannich To Mr. wasslope range. Clough
ofthe tract Lewisian Gneiss fromassigned complicated stretching
a'Loch Maree to Beinn to Mr. someChaisgein Beag; Greenly,
areas near Loch na the of andisolated Sheallag, Kinlochewe,Heights
on either side of Loch to Messrs. andMaree; Hinxman, Pocock,
of the Eastern Schists in the north-east and south-Crampton, parts
east corners of the and on Beinn nan Kamh near the head ofmap,
aLoch and to Mr. of Torridon SandstoneFannich; Cadell, patch
the north-east shore of Little Loch Broom.
along
Detailed of the and CambrianLewisian, Torridonian,descriptions
and of the tectonics of the belt of haverocks, complication, already
"on of the North-in the Memoir The Structureappeared Geological
which are here in a condensed formWest Highlands," reproduced
with some of the horizontal sections. As the Eastern Schistsregardsiv
Preface.
the various officers have furnished of theirdescriptions respective
areas. the most feature connected with thesePerhaps interesting
rocks is the account of the remarkable structure of thegeological
Fannich
range.
Almost the whole of the of the rocks within thispetrology
Sheet has been done Dr. ATeall. few have beenby specimens
examined and on Dr. Flett.reported by
The memoir has been edited Dr. Home. Plates 1. to V. haveby
been from taken Mr. Lunn. We are indebtedprepared photographs by
to the Kev. Mr. Eobertson of Eannoch for the excellent photograph
of the come rock-basin on An in Plate VI.Teallach, represented
The in the has beenBibliography given Appendix prepared by
Mr. Tait.
J. J. H. TEALL,
Director.
Geological Survey Office,
28 London.Jermyn Street,
21st November 1912.