La geologia della parte settentrionale del lago inglese foglio districtQuarter 101 SE(inclusi fogli 63, 64, 69, 70, 71, 76 e porzioni di 54, 55, 56, 57, 62, 65, 68, 73, 74, 75, Cumberland e 12, 18, 19, Westmoreland, sulla scala di sei pollici per un miglio) . d mostlikely proprio al periodo di metamorfismo {vedi precedente remarkson vene di quarzo, pagina 6). Sembra probabile, in presentinstance, che la parziale sfaldatura è stata prodotta da metamorphismafter la scissione era stata eifected mediante la pressione laterale o chenon era un prolungamento dello stesso procedimento e quindi l'ex tookplace principalmente al

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The geology of the northern part of the English lake districtQuarter sheet 101 SE(Including sheets 63, 64, 69, 70, 71, 76, and portions of 54, 55, 56, 57, 62, 65, 68, 73, 74, 75, Cumberland, and 12, 18, 19, Westmoreland, on the scale of six inches to a mile) . d mostlikely at the very period of metamorphism {see previous remarkson Quartz Veins, page 6). It seems probable, in the presentinstance, that the partial foliation was produced by metamorphismafter the cleavage had been eifected by lateral pressure, or thatit was an extension of the same process, and hence the former tookplace mostly along the planes of the latter, though becomingdeveloped along some of the original bedding planes where thecharacter of the rocks had prevented a perfect cleavage.t * A very similar series of changes has been observed by Fuchs in the meta-morphism of the clay-slate of St. Savieur, in the Pyrenees. Die alter Sediment- Formationen und ihre metamorphose in den Franzbsichen Pyrenaen, Leonhard.Jahrbuch, 1870, p. 717. I See also Chap. XI. Theoretic subjects connected with the granites of the districtare being treated by the author in papers brought before the Geological Society. «3 4! ? § = wipi^n ftf ?? f^ WW ^ K W :? 2 K V: ?? *- r : :?>. 5 ^ ^ 5 ?i! 1 ? ri 13 CHAPTER IV. DESCRIPTION OF THE HOCKS—continued. 2. Volcanic Sebies of Boreowdale. In substituting the name of Volcanic Series of Borrowdalefor that of Green Slates and Porphyries, I follow the propositionof Profs. Harkness and Nicholson, as given in a paper by thelatter in 1872.* The old name given by Prof. Sedgwi(*, whileapplicable to a part of the group, by no means represents thecharacter of the whole, and since the term porphyry as q, generic name is in all probability doomed, its use in an adjectiveform being alone retained, it would seem better to call this grouof rocks after the place where most typically developed. (a.) Typical section of lavas and ashes. This series of anciently erupted lavas and ashes presents

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• bookcentury1800
• bookdecade1870
• booksubjectgeology
• bookyear1876