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NW Scotland: Hebridean Terrane

By
A. W. A. Rushton
A. W. A. Rushton
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Published:
January 01, 2000

Abstract

The Hebridean Terrane is a fragment of the Laurentian craton made up mainly of Lewisian Gneiss and Torridonian sedimentary rocks of later Proterozoic age. These rocks were peneplaned and formed a broad but shallow marine shelf upon which a succession of Cambrian-Ordovician rocks was deposited. Durness Group carbonates of Cambrian to Ordovician age overlie conformably Lower Cambrian arenaceous rocks; the outcrop extends for nearly 200 km, from Eriboll in the north to Skye in the south. The Durness Group is most completely preserved in a half-graben at Durness.

Peach et al. (1907) described the Geological Survey’s detailed mapping of the north-west highlands (see Oldroyd 1990), the basis for all subsequent work. Correlation of the upper parts of the group is dependent on faunal evidence. The stratigraphical succession adopted here is shown in Columns 86-89, the principal divisions of the Durness Group being treated as formations, following Cowie et al. (1972). The faunas are exclusively of Laurentian type and, having nothing in common with coeval faunas in England and Wales, gave some of the first-described and best evidence for the former existence of the Iapetus ocean.

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Contents

Geological Society, London, Special Publications

A revised correlation of Ordovician Rocks in the British Isles

R. A. Fortey
R. A. Fortey
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D. A. T. Harpe
D. A. T. Harpe
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J. K. Ingham
J. K. Ingham
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A. W Owen
A. W Owen
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M. A. Parkes
M. A. Parkes
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A. W. A. Rushton
A. W. A. Rushton
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N. H. Woodcock
N. H. Woodcock
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Geological Society of London
Volume
24
ISBN electronic:
9781862396920
Publication date:
January 01, 2000

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