. The geology of the Oamaru district, North Otago (Eastern Otago division). NW &? Fjg. 11. DiAGBAMMATIC SECTION OF ScARP-FACE 300 YaRDS SoUTH-EAST OF MaHENO MiLL, Kakanxti Waiareka tuffs. c. Oamarji stone. 6. Grey chalky clays with limestone bands. d. Basaltic sill. Still farther down the Kakanui Valley the Waiareka tuffs are found to be stronglydeveloped at Taipo Hill, which is a tuft cone 300 ft. high, in many^ places seamedwith narrow dykes of basalt. On the north bank of the Kakanui River due west ofthe summit of Taipo Hill one of these dykes, through the denudation of the softer
. The geology of the Oamaru district, North Otago (Eastern Otago division). NW &? Fjg. 11. DiAGBAMMATIC SECTION OF ScARP-FACE 300 YaRDS SoUTH-EAST OF MaHENO MiLL, Kakanxti Waiareka tuffs. c. Oamarji stone. 6. Grey chalky clays with limestone bands. d. Basaltic sill. Still farther down the Kakanui Valley the Waiareka tuffs are found to be stronglydeveloped at Taipo Hill, which is a tuft cone 300 ft. high, in many^ places seamedwith narrow dykes of basalt. On the north bank of the Kakanui River due west ofthe summit of Taipo Hill one of these dykes, through the denudation of the softertuffs, now stands up conspicuously as an unsupported wall to a height of nearly25 ft. This dyke strikes north-east-south-west. It varies from 2|^ ft. to 3 ft. thick,and shows a well-developed columnar structure in which the prisms lie at rightangles to the plane of the Fig. 12.—Section of North Bank of Kakanxti River, a Quarter of a Mile due West of Taipo Hill. (Distance, 65 yards.)a. Thin-bedded brown tufis. b. Palagonite tuff; 6 ft. c. Basaltic dyke ; 2o ft. to 3 ft. 45 Section Jrom Big Hill to London Creek. The relationship of the Waiarekan tuffs to the Ngaparan coal-measures lying belowthem and to the Oamaru stone lying above is well seen in the section from BigHill to the south-west branch of Landon Creek. BujmiJ04l Cool Mviie Co( \ Hor^e CTv\.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1918
