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Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
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<blockquote data-quote="user 4386" data-source="post: 289279" data-attributes="member: 4386"><p>Yes, although overall with pet wood I would think it most cases it is not tens of millions of years, as I note above. However later replacement processes are common. Australian precious opal is mostly mid-Tertiary but it replaces things like Jurassic dinosaur bones, ikaiite crystals, brachiopods and belemnites. That is a very long time interval between the fossil being deposited and the silica replacement occurring (more than 150 My).</p><p></p><p>Agree re Crinum. I have another post where I walked a lava flow only weeks old in Hawaii and it was a graveyard of preserved tree stumps (I photographed them but unfortunately can't locate photos). Not so surprising - a fairly fluid lava flow in a tropical downpoor will trap things, solidify but prevent burning of wood. In things like coal seams I suspect that the oxygen-poor (anaerobic) conditions prevent oxidation of wood and suppress the bacteria and other organisms that would normally destroy it rapidly (just hypothesizing)</p><p></p><p>Not my photos:</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4386/1478738818_dinosaur_skin.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4386/1478738818_opal_fossils.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="user 4386, post: 289279, member: 4386"] Yes, although overall with pet wood I would think it most cases it is not tens of millions of years, as I note above. However later replacement processes are common. Australian precious opal is mostly mid-Tertiary but it replaces things like Jurassic dinosaur bones, ikaiite crystals, brachiopods and belemnites. That is a very long time interval between the fossil being deposited and the silica replacement occurring (more than 150 My). Agree re Crinum. I have another post where I walked a lava flow only weeks old in Hawaii and it was a graveyard of preserved tree stumps (I photographed them but unfortunately can't locate photos). Not so surprising - a fairly fluid lava flow in a tropical downpoor will trap things, solidify but prevent burning of wood. In things like coal seams I suspect that the oxygen-poor (anaerobic) conditions prevent oxidation of wood and suppress the bacteria and other organisms that would normally destroy it rapidly (just hypothesizing) Not my photos: [img]https://www.prospectingaustralia.com/forum/img/member-images/4386/1478738818_dinosaur_skin.jpg[/img] [img]https://www.prospectingaustralia.com/forum/img/member-images/4386/1478738818_opal_fossils.jpg[/img] [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
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