On the Tertiary Volcanic Rocks of the Bristish Islands

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Abstract
I n the present communication I propose to offer to the Society the first of a series of papers descriptive of those latest of the British volcanic rocks which intersect and overlie our Palæozoic and Secondary formations, and which, from fossil evidence, are to be regarded as of miocene, or at least of older Tertiary, date. Materials for this purpose have been accumulating with me for some years past. In bringing forward this first instalment of them, I wish to preface the subject with some general introductory remarks regarding the place which the rocks seem to me to hold in British geology, and on the nomenclature which I shall use in describing them. These remarks will be followed by a detailed description of the first of a succession of districts where the characteristic features of the rocks are well displayed. Other typical districts will be described in future memoirs.

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