Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-25T04:18:32.072Z Has data issue: false hasContentIssue false
  • English
  • Français

Notes on the Geology of Sula Sgeir and the Flannan Islands

Published online by Cambridge University Press:  01 May 2009

Malcolm Stewart
Get access Rights & Permissions [Opens in a new window]

Summary

Sula Sgeir consists of hornblende-gneiss with occasional biotite and augite. The whole is intersected by small pegmatite veins which merge along the borders into the gneiss. Though evidence is small, it seems probable that the island, together with North Rona, came under the influences of the Quaternary ice.

The Flannan Islands consist also of hornblende gneiss, biotite being a fairly common accessory. Numerous and varied pegmatite Veins occur throughout the islands, and in certain cases have affected the foliation of the gneiss. Owing to the proximity of the islands to the Lewis and the Harris, and the presence of adeposit of cemented sand on Eilean Ghobha, it seems probable that the Quaternary ice also reached these islands.

Type
Original Articles
Information
Geological Magazine , Volume 70 , Issue 3 , March 1933 , pp. 110 - 116
Copyright
Copyright © Cambridge University Press 1933

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

MacCulloch, J., Description of the Western Isles, London, 1819, i.Google Scholar
MacCulloch, J., Highlands and Islands, London, 1824, iii.Google Scholar
Heddle, M. F., In Harvie Brown’s Fauna of the Outer Hebrides, London, 1889.Google Scholar
Heddle, M. F., Mineralogy of Scotland, Edinburgh, 1901.Google Scholar
Geikie, James, The Great Ice Age, third edition, London, 1894, 157.Google Scholar
Reid, D. M., “On a Raised Beach on the North Coast of Scotland,” Geol. Mag., LXVI, 1929, 177–180.Google Scholar
Stewart, Malcolm,. “Notes on the Geology of North Rona,” Geol. Mag., LXIX, 1932, 179–185.CrossRefGoogle Scholar