. The Quarterly journal of the Geological Society of London. 5. Photomicro, J. I. Elsden. Benirose, Collo. LLYN PADARN DYKE-ROCKS. Vol. 60.] THE LLYN-PADARX DYKES. 387 from a greenstone-dyke in the Penrhyn Slate-Quarry, supports thisview; but a large number of analyses of the Caernarvonshire rockswould be necessary before Mr. Harkers differentiation-theory couldbe adequately tested on chemical grounds. This theory is virtuallyan application of Gouy & Chaperons principle,1 which, it is true,receives some support from physical chemistry and from observa-tions in the case of certain With
. The Quarterly journal of the Geological Society of London. 5. Photomicro, J. I. Elsden. Benirose, Collo. LLYN PADARN DYKE-ROCKS. Vol. 60.] THE LLYN-PADARX DYKES. 387 from a greenstone-dyke in the Penrhyn Slate-Quarry, supports thisview; but a large number of analyses of the Caernarvonshire rockswould be necessary before Mr. Harkers differentiation-theory couldbe adequately tested on chemical grounds. This theory is virtuallyan application of Gouy & Chaperons principle,1 which, it is true,receives some support from physical chemistry and from observa-tions in the case of certain With regard to the exact time of the intrusions, it is certain thatthe fissures were not open before the crush began, because there is verylittle evidence of displacement in the dykes themselves. The Clegyrdyke alone shows any marked sign of deflection. Mr. Harker,however, mentions the occurrence of local thickening of some of thedykes in the slate-quarries 3 owing to the effects of the thrust. Itmight also be urged as an objection to the view that these fiss
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
