Transactions and proceedings of the New Zealand Institute . chalk the upper deposit. At the time of the deposition of the bed, Mount Oxford(1,392 feet high), distant about five miles, must have existed asan island, whence disintegrated rock would be borne to the high percentage of silica in the lower beds points to com-paratively shallow water. Gradually the coast sank; less andless silica was deposited among the chalk; and, finally, thewater became pure enough to admit of the growth of a coral reef,teeming with Foraminifera. 13 ut the elevatory agencies reassert themselves ; the coast
Transactions and proceedings of the New Zealand Institute . chalk the upper deposit. At the time of the deposition of the bed, Mount Oxford(1,392 feet high), distant about five miles, must have existed asan island, whence disintegrated rock would be borne to the high percentage of silica in the lower beds points to com-paratively shallow water. Gradually the coast sank; less andless silica was deposited among the chalk; and, finally, thewater became pure enough to admit of the growth of a coral reef,teeming with Foraminifera. 13 ut the elevatory agencies reassert themselves ; the coastrises. Volcanic disturbance follows long ages of tranquillity :basaltic lava streams How, where formerly the quiet lagoonexisted ; but although they may have obliterated the beauty ofthe scene at the time, yet to them we owe the preservation ofthis exceedingly interesting record of a portion of the pasthistory of our island. * Specimens collected by Mr. John Ingram, Lab. Nos. 2597 aud 2819. Iransmjiiutts Ifsttt gt$»hti|& Jttstitttt*, Vol. xx. pi. OJF OJCFOIUZ CttAJUJC. JEajs6
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
