On the so-called Diorite of Little Knott (Cumberland), with further remarks on the Occurrence of Picrites in Wales

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Abstract
In my second note on the hornblende-picrite boulders which are scattered over the neighbourhood of Ty Croes, Anglesey, I briefly noticed a similar rock which occurs in situ at Little Knott in the Lake District, and has been described by the late Mr. Clifton Ward as an exceptional variety of diorite. In the spring of last year I was enabled to visit this district, and had the advantage of the company of Mr. J. Postlethwaite of Keswick, whose local knowledge was of great assistance to me. Little Knott is a slight prominence or shoulder on the crest of Long Side, a spur from the main mass of Skiddaw, where the former begins to fall more sharply down to the lowlands on the north. The picrite is represented on the six-inch map of the Geological Survey as an elongated dyke-like mass, running nearly E. and W. for about 650 yards, and generally about 40 yards wide, the outcrop of which extends from Little Knott across a ravine to a point at about the same elevation on the opposite ridge. The boundary, however, is inferential in a part of this area, as the rock is by no means continuously exposed, no small portion being covered with turf. Long Side consists of Skiddaw Slate ; at one locality on its western slope Graptolites are not rare, and here Mr. Postlethwaite on the occasion of our visit discovered a Lingula . At Little Knott itself the picrite mass, being about its usual width, is bounded

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