On the Igneous And Pyroclastic Rocks of the Berwyn Hills North Wales
The book On the Igneous And Pyroclastic Rocks of the Berwyn Hills North Wales was written by author Thomas Henry Cope Here you can read free online of On the Igneous And Pyroclastic Rocks of the Berwyn Hills North Wales book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is On the Igneous And Pyroclastic Rocks of the Berwyn Hills North Wales a good or bad book?
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294. 92 "A pe^. Liar rock resting on a thick mass of dark greenstone: "the pale greenish-grey rock is believed to be a ' greenstone ash' in "contradistinction to a ' f elstone ash. ' Jevons, * in the only paper since dealing with this area, assumed a succession of Quartz-keratophyre tuffs, with a lava of the same composition at their base, and the latter is declared to be intrusive. In the early part of the present paper the late author states that the Carnedd-y-Ci intrusion may be resolved t/ ...*/ into " a single band of a somewhat unusual type of rock, " without any association of tuffs. The sheet is but of slight thickness, although it presents a broad outcrop in the field. The dip and slope of the ground coincide, and the cover of peat permits of few exposures. In Clochnant the line of fault exposes a coarse dolerite nearly in contact with Bala slates on the Fronwen side. In Cwni Dywyll the outcrop is clearer, and from thence to the valley of Ysgeriau n wide expanse of loose blocks indicates the position of the sill.
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