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Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
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<blockquote data-quote="shivan" data-source="post: 289235" data-attributes="member: 194"><p>Some beautiful pieces Lefty, some of the bits in the fourth photo look like stalactites.</p><p></p><p></p><p></p><p>This is why most of the wood preserved is from trees and wood that wend down in water or stumps that were close by the water, because you get a lot of rapid deposition associated which aids in the initial preservation. I am sure most of us have seen how devastating a good flood can be, imagine all the trees, bits of wood and stumps that can get buried during these events. Heck even think of drift wood. </p><p>With rapid deposition, whether from floods, basin, swamp, volcanic ash or lava, the wood does not have time to decay like it normally would. </p><p>But i think what goldierocks is getting at, is that even if a forest was buried in volcanic ash, this does not ensure the wood will be petrified as it still needs silica rich waters flowing through the ground to start the silica replacing the wood. This i believe is not something that happens over night, but is an extremely lengthy process.</p><p>In saying that i believe there are cases where the lava flow itself has preserved wood, such as the basalt flow at Crinum, Central Queensland. Where fossilized wood is pulled directly out of the basalt.</p><p></p><p>Lefty a quick question, the wood in your area you find, i assume you mainly grab it out of the creeks/rivers but do you know what rock it is coming out of or has shed from?</p></blockquote><p></p>
[QUOTE="shivan, post: 289235, member: 194"] Some beautiful pieces Lefty, some of the bits in the fourth photo look like stalactites. This is why most of the wood preserved is from trees and wood that wend down in water or stumps that were close by the water, because you get a lot of rapid deposition associated which aids in the initial preservation. I am sure most of us have seen how devastating a good flood can be, imagine all the trees, bits of wood and stumps that can get buried during these events. Heck even think of drift wood. With rapid deposition, whether from floods, basin, swamp, volcanic ash or lava, the wood does not have time to decay like it normally would. But i think what goldierocks is getting at, is that even if a forest was buried in volcanic ash, this does not ensure the wood will be petrified as it still needs silica rich waters flowing through the ground to start the silica replacing the wood. This i believe is not something that happens over night, but is an extremely lengthy process. In saying that i believe there are cases where the lava flow itself has preserved wood, such as the basalt flow at Crinum, Central Queensland. Where fossilized wood is pulled directly out of the basalt. Lefty a quick question, the wood in your area you find, i assume you mainly grab it out of the creeks/rivers but do you know what rock it is coming out of or has shed from? [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
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