. The geology of the Oamaru district, North Otago (Eastern Otago division). ^ tufaceous and friable, as may be seen between theold limestone-quarry at Kakanui and Trig. T. This friable polyzoan band represents theupper band of Oamaru stone. It is often crumbling and friable, and where tufaceoususually contains small brachiopods, among which Terebraluliiia -suessi (Hutt.) is alwaysconspicuous. From a point a little south of Trig. T the Kakanui limestone and underlying upperband of tufaceous Oamaru stone dij) towards the sea, and along the coast for halfa mile iorm a low undercut rock-shelf fron
. The geology of the Oamaru district, North Otago (Eastern Otago division). ^ tufaceous and friable, as may be seen between theold limestone-quarry at Kakanui and Trig. T. This friable polyzoan band represents theupper band of Oamaru stone. It is often crumbling and friable, and where tufaceoususually contains small brachiopods, among which Terebraluliiia -suessi (Hutt.) is alwaysconspicuous. From a point a little south of Trig. T the Kakanui limestone and underlying upperband of tufaceous Oamaru stone dij) towards the sea, and along the coast for halfa mile iorm a low undercut rock-shelf fronting the sea. To the southward, oppositethe old quarry the limestone is bent up at the edge so as to override the Kakanuibreccia and tuffs that are strongly developed from here to the North Head. Theturning-up or warping of the southern edge of the limestone exposes the rocks belowit on the coast below the a h c d Fig. 30.—^Section on North or Kakanui Quarry. a. Kakaniii breccias and tuffs. b. Hard calcareous fossiliferous volcanic breccia; gradually loses its calcareous cliaiacUr to tlie southward. and merges into a mottled brownish-greon tuff ; 9 ft. thick. c. Thin-bedded blue and grejish-blue clays and fine soft sandstones. The upper 18 in. are line tuffs; and all the material forming the clays and .sandstones is tufaceous, and speckled throughout with pieces ofash and fine breccia. Thickness, 17 ft. From the clays was collected a single example f)f Liolfiyrellaboehmi Thomson. d. Calcareous rubblv tufaceous bed, varying from 0 in. to 18 in. thick ; richly fossihferous. This is bed f/ of Fig. 29. e. Yellowish-grey polyzoan limestone; 3() ft. thick. /. Hard semi-crystalHnc limestone: :50 ft. thick. The fossils collected from beds b and (/ have already been enumerated on thepreceding page. CONFIRMATORY SECTIONS. Section Jrmn Beach below Trig. T to near Three Roads. From a point
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1918
