Identifier: transactionsofro19200roya (find matches)
Title: Transactions of the Royal Society of New Zealand
Year: 1920 (1920s)
Authors: Royal Society of New Zealand
Subjects: Science
Publisher: Wellington, N.Z. : The Society
Contributing Library: Brigham Young University Hawaii, Joseph F. Smith Library
Digitizing Sponsor: Consortium of Church Libraries and Archives

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formed by the checking of the sediment-laden ebb tide drawing outof the harbour by the waves raised by the prevalent north-westerly winds.Part of the deposited sediment would then be cast back upon either of theadjacent shores, and would accumulate at the heads of embayments toform sandy beaches. Dunes of blown sand derived from the sandy beachescover small areas at several places along the shore of the harbour. The Origin of the Harbour and the Evolution of its Shore-line. The deposition of the Trias-Jurassic sediments and their subsequentfolding and uplift followed by peneplanation appear to have been the earliestdiastrophic and physiographic events in the area under notice. Theseconditions held until the advent of a second period of diastrophism (theKaikoura deformation). The peneplaned land-surface was first upliftedand then block-faulted on a large scale, the squeezing of the earth-blocksby the compressive forces within the earths crust being in all probability 154 Transactio ns.
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m o g►U.a hiIS©* £ *g I oo Oh 2 fl^ OT 03 r-H , o a 3 a fl o a ft ft r o 3 5 O a .4 - « -5 l© 14 LO w ^5^3 if 2 S « T5 S ^^ ^ ^ ^ aho bo o iH =£ ce ffi-P fl O) ft-S o S -§ ° o E _ O o3 £ © £ o s ,a «3 so 8; O 4h eL5h; 3 ^ -^ — o * o o a a >s ^ cS C 3 bD a c > 03 O c3 ^ a^a a3 -P =<H 6 6 Adkin.—Porirua Harbour. 155 a factor in the elevation of the higher blocks. In what is now the southernpart of the Wellington district the main earth-blocks have a N.N.E.-S.S.W.direction, this being the general trend of the principal fractures. Thepresent high-standing blocks were in some cases uplifted uniformly, butmore commonly tilted, the usual direction of the tilt being towards thewest. The compression that accompanied the block-faulting and contri-buted to the uplift of the high-standing blocks was also responsible for thewarping of the upper surfaces of these. The warping took the form of

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