The Rocks of Cape Colville Peninsula Auckland New Zealand volume 2
The Rocks of Cape Colville Peninsula Auckland New Zealand volume 2
W J William Johnson Sollas
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Slice shows medium contrasts. Photographed by polarised light ; magnification, 33 diameters. Locality. Mangamaire Ridge, Kaimanawa Mountains, Wellington. Formation. Younger Pliocene or Pleistocene. Remarks. The specimen is from a pumiceous deposit on the top of a mountain- ridge nearly 4, 000 ft. Above the sea. This and similar deposits in the neighbouring mountains that are at all flat-topped have resulted due to volcanic explosions, the material from which air-borne has accumulated to a depth... of many feet in the positions indicated. No. 425/4839. M. C. Dark-grey flow-rock, with phenocrysts of felspar. U. M. MATRIX : Porous, with rounded cavities ; colourless aiid glass- like by ordinary light, with minute brownish granules and numerous belonites and margarites in obvious stream-lines ; between x. N. Resolved for the greater part into minute negative microspherulites, with a residuum of isotropic glass. PHENOCRYSTS. Plagioclase : Well-formed glassy clear crystals ; r. I. , above balsam ; extinction generally low, but sometimes reaches 29 (andesine labra- dorite) ; abundant, of small size, often in clusters, also in fragments.
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