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The Old Red Sandstone Lavas of the Western Sidlaw Hills, Perthshire

Published online by Cambridge University Press:  01 May 2009

W. T. Harry
W. T. Harry
Affiliation:
Department of Geology, The University, St. Andrews.
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Abstract

The Old Red Sandstone lavas of the Perthshire Sidlaws are basalts with some andesite-basalts, andesites, and rare trachyandesite. The basalts comprise chiefly olivine-bearing flows that include feldspar-phyric and aphyric varieties; olivine-free basalts with two pyroxenes are of restricted distribution.

The significance of augite textures and their relationship to augite content in the basalts is discussed.

The lava pile is apparently composed of interdigitating lenticular flows that vary from a few feet up to about 80 feet in thickness.

Unlike most other Scottish Old Red Sandstone lava suites the Sidlaw suite is fairly fresh and, like the Eastern Forfarshire lavas, it is relatively basic.

Type
Articles
Information
Geological Magazine , Volume 93 , Issue 1 , February 1956 , pp. 43 - 56
Copyright
Copyright © Cambridge University Press 1956

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References

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