The geology of the Coromandel subdivision, Hauraki, Auckland . Hornblende Da< ite, Tertiart Volcanic Rocks of Second Period, South Sum; of Cabbage BaiMagnification, 50 diameters. Work of Mr. Alexandei McKay, S Geo. Hull No. ; ] To fact p. PLATE Htalofilitic Hypersthene Andesite, Tertiary Volcanic Rocks of Second Period, North Side of Manaia Harbour. Magnification, 33 diameters. Work of Mr. Alexander McKay, Geo. Bvll. No. ,.\ [To face f. 83 In the vicinity of the western coast-line, the only rock determined which should be included underthe present heading was a glassy ande
The geology of the Coromandel subdivision, Hauraki, Auckland . Hornblende Da< ite, Tertiart Volcanic Rocks of Second Period, South Sum; of Cabbage BaiMagnification, 50 diameters. Work of Mr. Alexandei McKay, S Geo. Hull No. ; ] To fact p. PLATE Htalofilitic Hypersthene Andesite, Tertiary Volcanic Rocks of Second Period, North Side of Manaia Harbour. Magnification, 33 diameters. Work of Mr. Alexander McKay, Geo. Bvll. No. ,.\ [To face f. 83 In the vicinity of the western coast-line, the only rock determined which should be included underthe present heading was a glassy andesite collected from the breccias a short distance to the south ofCabbage Bay. (c.) Hornblende Andesites.—Hornblende andesites have a fairly wide range within the areas of the Second Period volcanics, both as pyroclastic and massive rocks. The amphibole, however, is acharacteristic mineral of many of the intrusions of this period, and, as already stated, it is not possibleto discriminate in every case between lava-flows and dykes. The localities where these rocks have been identified either by Sollas and McKay or by the writersmay be submitted. Hyalofilitic hornblende andesites occur at— Sugar Loaf Headland (Moehau Survey District): As inclusions
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Keywords: ., bookcentury1900, bookdecade1900, bookidgeolog, booksubjectgeology
