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III.—Notes on the Geology of Perim Island3

Published online by Cambridge University Press:  01 May 2009

Catherine A. Raisin
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Extract

Iam indebted to Mr. J. A. Rupert Jones (Lieut. R.N.R.), now at Aden, for a series of rock specimens collected and sent from Perim Island, accompanied by notes and diagrams. From all these I have drawn up a short preliminary account, since they illustrate some points of interest, and no complete description of the geology of the island, as far as I know, has been published.

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 5 , May 1902 , pp. 206 - 210
Copyright
Copyright © Cambridge University Press 1902

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Footnotes

3

An abstract of this paper was read at the British Association Meeting, Glasgow, 1901.

References

page 206 note 4 The above depths are taken from the Admiralty Chart.

page 207 note 1 At one spot, in the north of the Red Sea, a recent accumulation of oolitic grains was described by Walther, J., “Die Korallenriffe der Sinaihalbinsel,” 1888.Google Scholar

page 207 note 2 Marked on the Admiralty Chart.

page 209 note 1 I have found in other basalts or basic andesites (as in one from Auvergne) this appearance of incipient spherulites, which are not distinguishable on microscopic examination.

page 209 note 2 Two slices lent me by MrSwamy, Coomara, taken from blocks near here, are from very similar rock, but with the glassy base better defined and without the brown pyroxene.Google Scholar

page 209 note 3 The disintegration of the rocks may have been helped by a rainfall greater in its amount in past times; and Mr. Jones remarks on the tanks built to hold water, now standing empty.

page 210 note 1 One example is described where the boulders appear as if piled by the sea, forming a kind of island in the middle of the Birkhud Raised Beach to the north of Perim.