petrography
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Legacy product - no abstract available
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Legacy product - no abstract available
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This report comprises descriptions of certain rocks collected by Dr. H.G. Raggatt in the Torquay - Airey's Inlet area, Victoria. The rocks are isolated specimens and no general conclusions applicable to the group as a whole have been drawn.
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Package comprises a digital compilation of regional mapping of Bathurst (SI5508) 1:250 000 map by AGSO and NSW Department of Mineral Resources, under NGMA from 1991 to 1996.
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The Petrography Database contains 29 701 descriptions of thin sections of rock and other geological material from Australia. The location is stored with each sample along with geological descriptions, including the host stratigraphic unit and lithology. Most samples have been collected by AGSO field parties.
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Package comprises a digital compilation of regional mapping of Bathurst (SI5508) 1:250 000 map by AGSO and NSW Department of Mineral Resources, under NGMA from 1991 to 1996.
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Legacy product - no abstract available
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Legacy product - no abstract available
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Legacy product - no abstract available
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Controls on the evolution of Tapora Island, an active barrier island located opposite the entrance to the Kaipara Harbour on the high-energy west coast of the North Island of New Zealand are identified. Subsurface facies form an aggradational barrier island succession from subtidal to subaerial elevations. These data, combined with surface samples and geomorphic and geologic relationships, indicate that Tapora Island is the most recent barrier island at this location in the estuary, and forms part of a prograded coast opposite the entrance. Wave data indicate that ocean swell waves penetrate the inlet for approximately two hours either side of high tide and are capable of transporting sand onto the island. The combined effects of swell waves, abundant sediment supply, and exposed aspect are the critical factors that have formed the barrier island. Despite the 'sheltered' estuarine setting, Tapora Island has formed under conditions that are more akin to open ocean coasts. The origin and development of Tapora Island broadly conforms to the accumulating barrier island model.