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Gemstones, Minerals & Fossils
Gemstones and Minerals
North Wollongong Beach fossicking
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<blockquote data-quote="oldbullhubbard" data-source="post: 664837" data-attributes="member: 8944"><p>Thanks Goldie rocks. The intriguing thing, though, is the agates that you find are consistently pea-sized or slightly smaller - they have been sorted by erosion and deposition over countless years. If they are associated with the basalt flows on the coast you might expect them to be of various sizes. </p><p>I believe there are two possibilities to explain their origin: </p><p>* the agates are a secondary phenomenon weathered out the conglomerate beds in the Narrabeen group, near the coal measures, so are much older than the basalts,</p><p>* or, they are the result of silica replacing original tiny shells contained in the sedimentary rocks (low temperatue precipation as you suggest). Anyway we'll probably never know until some proper geological field work is done. Great to chat.</p></blockquote><p></p>
[QUOTE="oldbullhubbard, post: 664837, member: 8944"] Thanks Goldie rocks. The intriguing thing, though, is the agates that you find are consistently pea-sized or slightly smaller - they have been sorted by erosion and deposition over countless years. If they are associated with the basalt flows on the coast you might expect them to be of various sizes. I believe there are two possibilities to explain their origin: * the agates are a secondary phenomenon weathered out the conglomerate beds in the Narrabeen group, near the coal measures, so are much older than the basalts, * or, they are the result of silica replacing original tiny shells contained in the sedimentary rocks (low temperatue precipation as you suggest). Anyway we'll probably never know until some proper geological field work is done. Great to chat. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
North Wollongong Beach fossicking
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