On Kentallenite and its Relations to other Igneous Rocks in Argyllshire

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Abstract
I. Introductory. In Mr. Teall's well-known work on ‘British Petrography’ a remarkable rock from the Kentallen quarries, near Ballachulish in Argyllshire, was figured and briefly described, 1 but it was not until the rock had been mapped by Mr. J. Grant-Wilson in 1896 that its peculiar characters were recognized and more fully described by Mr. Teall in the Annual Report of the Geological Survey under the term olivine-monzonite. 2 This term was assigned to the rock on account of the resemblance which it showed to the monzonitegroup of Prof. Brögger. 3 Mr. Teall pointed out, however, that there was at the same time a considerable difference, consisting mainly in the relative proportion of magnesia, between the Highland rock and the olivine-monzonite rock of Brögger. Since that time similar and closely-allied rocks from other localities have been investigated by us; and it is our object in the present paper to endeavour to point out the relationships of this unique petrological type to the granites and other intrusive rocks of Argyllshire, and so to remove it from a hitherto somewhat isolated position. Moreover, an examination of several varieties of the normal type has led us to reconsider the advisability of retaining Prof. Brögger's term for a group of rocks which evidently show in certain respects a marked divergence from the original type. The term monzonite originates from Prof. A. de Lapparent (1864), who applied it to the well-known augite-syenite of Monzoni, in the Tyrol. Since then the term has been employed by different authors slightly

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