The Quarterly journal of the Geological Society of London . ^ of the well-known varieties of Mexican obsidians. Mr. G. F. KuNz stated that the locality in Jalisco was about onehundred miles west of Mexico city, and one hundred and fifty milesnorth-west of Pachuca ( Navajas ), the Hill of Knives. )nrr. Onol Soc Vg! XlAll V: XVIll. m Hutlev del iitK. / ZAU Rros . imp. KKOM PILAS, JALISCO, OBSIDIAN VULCANOJJPARI P PERLITIC OBSIDIAN FKOM PILAS, MEX£CO. 533 ISfr. RuTLEY, in rt]>ly to Irof. Judds remarkH, stated that,;ilthoiij?h the specimen resem
The Quarterly journal of the Geological Society of London . ^ of the well-known varieties of Mexican obsidians. Mr. G. F. KuNz stated that the locality in Jalisco was about onehundred miles west of Mexico city, and one hundred and fifty milesnorth-west of Pachuca ( Navajas ), the Hill of Knives. )nrr. Onol Soc Vg! XlAll V: XVIll. m Hutlev del iitK. / ZAU Rros . imp. KKOM PILAS, JALISCO, OBSIDIAN VULCANOJJPARI P PERLITIC OBSIDIAN FKOM PILAS, MEX£CO. 533 ISfr. RuTLEY, in rt]>ly to Irof. Judds remarkH, stated that,;ilthoiij?h the specimen resembkd a pitchstono in lustre, lie wasinelined to believe this due to partial devitrification, as indicated inthe paper. It was, however, difficult at times to say positivelywhether minute bodies, such ns globulites, lonj^ulites, &e., presentin a vitreous rock were developed at the time of solidification or ata subsequent period; but he was disposed to regard them in thiscase as secondary products. It was fortunate that Mr. Kunz waspresent and able to describe the locality from which the specimenwas derived. 2p2 534 THE MELAPHYRE8 AND FELSITES OF CARADOC. 29. On some of the Mblaphiebs of Caradoc, witJi Notes on theAssociated Felsites. By Frank Huxley, Esq., , Lectureron Mineralogy in the Royal College of Science,
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
