The geology of the Coromandel subdivision, Hauraki, Auckland . tal .. .. 100-44 (b.) Pyroxene Andesites.—The pyroxene andesites are not of very common occurrence among thevolcanics of the Second Period, since augite, while present to a minor extent in almost all the rocks,rarely becomes as abundant as hypersthene. The general appearance of these rocks and the characters of the groundmass are the same as thoseof the hypersthene andesites. On the eastern side of the peninsula, pyroxene andesites have beencollected from Waihirere Creek and from the coast-line two and a half miles southward, both
The geology of the Coromandel subdivision, Hauraki, Auckland . tal .. .. 100-44 (b.) Pyroxene Andesites.—The pyroxene andesites are not of very common occurrence among thevolcanics of the Second Period, since augite, while present to a minor extent in almost all the rocks,rarely becomes as abundant as hypersthene. The general appearance of these rocks and the characters of the groundmass are the same as thoseof the hypersthene andesites. On the eastern side of the peninsula, pyroxene andesites have beencollected from Waihirere Creek and from the coast-line two and a half miles southward, both localitiesbeing within the Waikawau - Kennedys Bay coastal belt. An altered pyroxene andesite from Mate-rangi Hill, Kuaotunu, has been identified by Sollas, and a similar rock from the Otanguru Creekby the writers. Further south occurrences of pyroxene andesites at Wade Creek (MahakirauValley), and in the Kaimarama River about a mile from its junction with the Mahakirau, may bementioned. * Rocks of Cape Colville Peninsula, vol. ii, 1906, p. 142. PLATE 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 XXVI.
Size: 1350px × 1850px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidgeolog, booksubjectgeology
