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1

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A Xenolithic Monchiquite Dyke Near Glenfinnan, Inverness-shire (1954)

Walker, G. P. L. ; Ross, J. V.

Cambridge University Press

In: Geological Magazine. 1954; 91(6): 463-472. Published 1954 Dec 01. doi: 10.1017/s0016756800066280.

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Publication Date: 1954-12-01

Description: The remarkable xenolithic dyke described in this paper is one of the little-known swarm of camptonite and monchiquite dykes of probable Permian age in the Northern Highlands of Scotland. It is the first intrusion containing xenoliths of ultrabasic rock to be recorded from the Glenfinnan area, although such xenoliths have been described from vents or intrusions of probable or known Permian age in Caithness in the extreme north of Scotland, and in Ayrshire and elsewhere in the south of Scotland.

Print ISSN: 0016-7568

Electronic ISSN: 1469-5081

Topics: Geosciences

Published by Cambridge University Press

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Ice-Borne Boulders in the Macduff Group of the Dalradian of Banffshire (1954)

Sutton, John ; Watson, Janet

Cambridge University Press

In: Geological Magazine. 1954; 91(5): 391-398. Published 1954 Oct 01. doi: 10.1017/s001675680006578x.

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Publication Date: 1954-10-01

Description: The paper describes a horizon of greywackes outcropping on the coast near Macduff, Banffshire, and containing large boulders of igneous and metamorphic rocks. This horizon belongs to the Macduff Group of the Upper or Banff Division of the Dalradian. It is suggested that the boulders may have been dropped into the greywackes from floating ice.

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Electronic ISSN: 1469-5081

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L. H.,

Cambridge University Press

In: Geological Magazine. 1954; 91(5): 415-415. Published 1954 Oct 01. doi: 10.1017/s0016756800065869.

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Publication Date: 1954-10-01

Print ISSN: 0016-7568

Electronic ISSN: 1469-5081

Topics: Geosciences

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Notes on the Ultrabasic Body of Unst, Shetland Islands (1954)

Amin, M. S.

Cambridge University Press

In: Geological Magazine. 1954; 91(5): 399-406. Published 1954 Oct 01. doi: 10.1017/s0016756800065791.

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Publication Date: 1954-10-01

Description: Within the main serpentine of Unst, a lower peridotite layer, a dunite layer, and an upper pyroxenite layer can be distinguished. These three zones have transitional contacts which are marked by a primary mineral banding. Analyses of specimens from each zone are given and it is suggested that the layering is due to differentiation in situ. The zones dip steeply eastward and the base of the intrusion is cut off on the west by a thrust which is slightly oblique to the banding and locally cuts out the peridotite zone. Interior planes of dislocation are parallel to, or perpendicular to, the primary banding.

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A New Palaeechinus from Alberta (1954)

Kier, Porter M.

Cambridge University Press

In: Geological Magazine. 1954; 91(3): 252-254. Published 1954 Jun 01. doi: 10.1017/s0016756800065225.

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Publication Date: 1954-06-01

Description: A new species of Palaeechinus from the Lower Carboniferous of Alberta is described.

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A New Ampthill Clay Fauna from Knapwell, Cambridgeshire (1954)

Hancock, J. M.

Cambridge University Press

In: Geological Magazine. 1954; 91(3): 249-251. Published 1954 Jun 01. doi: 10.1017/s0016756800065213.

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Publication Date: 1954-06-01

Description: A new ammonite assemblage from the Ampthill Clay is recorded. Its correlation with the Trigonia clavellata beds of Dorset indicates that these condensed beds are represented by two distinct horizons in the Ampthill Clay—the Boxworth Rock below and the Knapwell Ditch horizon above.

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Cyrtograptids and Retiolitids from County Tipperary (1954)

Cope, R. N.

Cambridge University Press

In: Geological Magazine. 1954; 91(4): 319-324. Published 1954 Aug 01. doi: 10.1017/s0016756800065316.

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Publication Date: 1954-08-01

Description: Cyrtograptus hamatus, first described from Ireland by Baily in 1862, is now described more fully from fresh material which can be assigned to the zone of C. lundgreni. The proximal part of C. lundgreni is also described. Three species of Retiolitids occur with the Cyrtograptids, one of which, Paraplectograptus eiseli Manck, has not previously been recorded in the British Isles.

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The Pegmatites of Trolvis Quarry, Carnmenellis, Cornwall (1954)

Hosking, K. F. G.

Cambridge University Press

In: Geological Magazine. 1954; 91(4): 273-285. Published 1954 Aug 01. doi: 10.1017/s0016756800065262.

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Publication Date: 1954-08-01

Description: The pegmatites of Trolvis Quarry, Carnmenellis, are small lenticular masses which were developed before the joints of the associated granite. Both mineralogically simple and complex types occur: the latter are drusy. Whilst the earlier minerals lining the druses may have crystallized in a closed system, the later minerals were clearly deposited from a moving phase. The disposition of the later minerals was largely determined by earlier crystals acting as baffles to the mineral-depositing agents. The pegmatites appear to occupy spaces formed by the solution of the granite by a pegmatitic fraction of the magma.

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