II. The Geognosy and Mineralogy of Scotland

Abstract
This is a mere fragment of gneissic rocks which is imbedded between the granite of Roeness and the igneous rock which lies to the east : but so different are these entrapped rocks from the ordinary gneiss of Shetland, and so violent a twist do they seem to have received athwart of their normal strike, that the enquiry rises-whence did this fragment come ?A spectator looking west from the top of Ornsfield, gazes seaward upon a mere heap of ruins ; while, looking landward, he also sees little else,-so riven and twisted are the rocks by the intrusion of dykes of porphyry, and so shattered and toppling from the invasion of the sea.

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