File:The Quarterly journal of the Geological Society of London (12961188135).jpg

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1869..
JOASS SUTHERLAND GOLD-FIELD.
319
gneissose strata (fig. 2). In a paper "On the Metamorphic
Rocks of the Banffshire coast, the Scarabins, and a portion of
rig. 1. — Section showing Granite in Mica-schist at Kil-Donnan Lodge,
12 1 2 1
1. Micaceous beds, dipping N.E. 2. Granite (b).
Pig. 2. — Oranitiform rock in decomposed Gneiss, Saisgitl.
JMMTlJIEjm
Mi
mi
1. Decomposed gneissose rocks, dipping S.S.W. and E.S.E.
2. G-ranitoid rock (c).
East Sutherland," read before the Geological Society in May 1862,
Prof. Harkness says : — ^' The correspondence of the strike of the plu-
toiiic masses with that of the metamorphic rocks has been noticed
in connexion with these several rocks in Banffshire. In Sutherland
it is even more apparent, and supports the inference that here plu-
tonic masses do not perform the office of axes. Their mode of
occurrence rather tends to the conclusion that the sedimentary rocks
were elevated, flexurcd, and contorted previous to the period when
the granites made their appearance in the sedimentary rocks, and
that the granites have conformed in their course to the strike of the
previously elevated strata. There are here abundant features which
would support the conclusion that granite is, in this district, rather
the result of an excessive amount of metamorphic action than a plu-
tonic rock as regards its origin." I venture to think that the
coarse-grained porphyritic granite of the Ord (a) should perhaps be
regarded as truly plutonic and associated with upheaval, from its
coincidence in strike with a great line of fault which traverses Scot-
land from N.E. to S.W. along the great Caledonian valley.
It is true, indeed, that instead of dipping away from this supposed
plutonic and upheaving mass the strata to the N.W. dip towards it,
becoming almost vertical as they approach the line of contact. This,
however, might be accounted for on the supposition that the up-
heaved and disrupted rocks, already dipping towards the intrusive
mass, would, until it hardened and could support them, dip still

more decidedly in the same direction as the result of their weight ;
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Source https://www.flickr.com/photos/biodivlibrary/12961188135
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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36103180
Item ID
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111288 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 319
BHL Page URL
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https://www.biodiversitylibrary.org/page/36103180
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 25 (1869).
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Flickr posted date
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6 March 2014
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This file comes from the Biodiversity Heritage Library.

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