Transactions and proceedings of the New Zealand Institute . andstonesintercalated with two sheets or sills of olivine-basalt. The tuffs contain a few indistinct fossils, and bed No. 7several minute bivalves and numerous Foramintfera. BedsNos. 9 and 11, and possibly No. 6, represent the OamaruStone proper. The presence of the basalt sill shows thatvolcanic activity was nearly contemporary with the depositionof the lower part of the Oamaru Stone in the Kakanui , both to the north and south, activity appears tohave ceased somewhat earlier. At Clarks mill the Oamaru Stone is interbed
Transactions and proceedings of the New Zealand Institute . andstonesintercalated with two sheets or sills of olivine-basalt. The tuffs contain a few indistinct fossils, and bed No. 7several minute bivalves and numerous Foramintfera. BedsNos. 9 and 11, and possibly No. 6, represent the OamaruStone proper. The presence of the basalt sill shows thatvolcanic activity was nearly contemporary with the depositionof the lower part of the Oamaru Stone in the Kakanui , both to the north and south, activity appears tohave ceased somewhat earlier. At Clarks mill the Oamaru Stone is interbedded with abed of clay with white chalky joints. This bed varies from athickness of 12 ft. behind the mill to a few inches at Tesche-makers, less than a mile distant. West of the latter placeit thins out altogether. The basalt sill as seen in the longi-tudinal section of the escarpment, about 2 chains nearer 508 Transactions.—Geology. the mill than the cross-section shown in fig. 1, has been in-truded partly along the plane of the clay-bed. The sill ends. /eo /<so j\r /zo 60 lo/& Section near Clarks Mills, Maiikno. 1. Dark-green tuffs, Waiareka tuffs, 60 ft. 2. Gritty sandstone, 4 ft. 3 Grey clays intercalated with layers of coralline limestone,5 ft. 6 in. to 7 ft. G. Yellowish-grey calcareous sandstone, Yellowish flaky clays, foraminiferous, 4 in. to 1 ft. Gin. 8. Sill ofolivine basalt, 22 ft. 9. Yellowish-grey calcareous sandstone, 7 ft. to8ft. 10. Sill of olivine-basalt, Sin. 11. Yellowish-grey calcareoussandstone, 25 ft. abruptly at the westward end. The detached mass of lime-stone entangled in the basalt tends to show that the cal-careous sediments had become partially consolidated beforethe intrusion of the lava. Ska-coast near Kakanui Township. From Kakanui Township northward for some distance thebeach is bounded by steep cliffs, and in many places is onlyaccessible at low tide. The Tertiaries which form the cliffsbounding the small bay or indentation
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1904
