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Showing results for tags 'silicification'.
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Timing of Opalization at Lightning Ridge, Australia: New Evidence from Opalized Fossils
Oxytropidoceras posted a topic in Fossil News
George E. Mustoe and Elizabeth T Smith, 2023. Timing of Opalization at Lightning Ridge, Australia: New Evidence from Opalized Fossils. Minerals 13(1471):1-43. Christian Voiculescu-Holvad, 2018. The Opalised Fossils of Australia: Mineralogical and Paleontological Treasures from the Australian Outback Yours, Paul H.-
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Arthropod entombment in weathering-formed opal (Indonesia - Cicada)
Oxytropidoceras posted a topic in Fossil News
Fossilized Cicada Entombed In Opal Reveals Precious Gems Can Contain Ancient Life Rachael Funnell, IFL_Science, October 7, 2023 https://www.iflscience.com/fossilized-cicada-entombed-in-opal-reveals-precious-gems-can-contain-ancient-life-57413 Rare Fossil Reveals Cicada Entombed in Opal An insect trapped in a precious gem points to new places to search for ancient life Carolyn Wilke, Scientific American https://www.scientificamerican.com/article/rare-fossil-reveals-cicada-entombed-in-opal1/ The open accesspaper is: Chauviré, B., Houadria, M., Donini, A. et al. Arthropod entombment in weathering-formed opal: new horizons for recording life in rocks. Sci Rep 10, 10575 (2020). https://doi.org/10.1038/s41598-020-67412-9 Yours, Paul H.-
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- cicada
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If this topic was posted in the wrong place feel free to pull out the whips and chains. These are being found at deposit of petrified wood in south Alabama. Silicification strata sure looks favorable in situ-clay, then 1 foot of wet sand and rounded quartzite, then the wood. No limb nots, most of it has straight parallel bands like a vascular plant. Occasionally some samples with annual rings. Complete logs are rare, most are segments from 5 to 50 pounds. It seems related to Tallahatta silicified sand(stone). And it seems to have silicified grey sand in it. Thanks in advance.
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Mustoe, G.E., 2015. Late Tertiary petrified wood from Nevada, USA: Evidence of multiple silicification pathways. Geosciences, 5(4), pp.286-309. https://www.mdpi.com/2076-3263/5/4/286 https://www.researchgate.net/publication/282851612_Late_Tertiary_Petrified_Wood_from_Nevada_USA_Evidence_of_Multiple_Silicification_Pathways https://sciprofiles.com/profile/112497 https://www.researchgate.net/profile/George_Mustoe Mustoe, G. and Acosta, M., 2016. Origin of petrified wood color. Geosciences, 6(2), no.25. https://www.mdpi.com/2076-3263/6/2/25 https://www.researchgate.net/publication/302497324_Origin_of_Petrified_Wood_Color Mustoe, G.E., 2017. Wood petrifaction: A new view of permineralization and replacement. Geosciences, 7(4), no.119. https://www.mdpi.com/2076-3263/7/4/119/htm https://pdfs.semanticscholar.org/4ff7/8f7c6899c4459c4f33e4d51c040f6374685d.pdf https://www.researchgate.net/publication/321170639_Wood_Petrifaction_A_New_View_of_Permineralization_and_Replacement Mustoe, G.E., 2018. Mineralogy of non-silicified fossil wood. Geosciences, 8(3), no.85. https://www.mdpi.com/2076-3263/8/3/85/htm https://www.researchgate.net/publication/323540027_Mineralogy_of_Non-Silicified_Fossil_Wood Mustoe, George E. "Non-mineralized fossil wood." Geosciences (8) no.223. https://www.mdpi.com/2076-3263/8/6/223 https://www.researchgate.net/publication/325827782_Non-mineralized_Fossil_Wood Luczaj, J.A., Leavitt, S.W., Csank, A.Z., Panyushkina, I.P. and Wright, W.E., 2018. Comment on “Non-Mineralized Fossil Wood” by George E. Mustoe (Geosciences, 2018). Geosciences, 8(12), no.462. https://www.mdpi.com/2076-3263/8/12/462/htm Mustoe, G.E., Viney, M. and Mills, J., 2019. Mineralogy of Eocene fossil wood from the “Blue Forest” locality, southwestern Wyoming, United States. Geosciences, 9(1), no.35. https://www.mdpi.com/2076-3263/9/1/35 https://www.researchgate.net/publication/330292211_Mineralogy_of_Eocene_Fossil_Wood_from_the_Blue_Forest_Locality_Southwestern_Wyoming_United_States Mustoe, G.E., 2015. Geologic History of Eocene Stonerose Fossil Beds, Republic, Washington, USA. Geosciences, 5(3), pp.243-263. https://www.mdpi.com/2076-3263/5/3/243 https://www.researchgate.net/publication/279786883_Geologic_History_of_Eocene_Stonerose_Fossil_Beds_Republic_Washington_USA Yours, Paul H.
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Exceptional Preservation of Soft-bodied Ediacara Biota Promoted by Silica-rich Oceans
Oxytropidoceras posted a topic in Fossil News
Cementing a theory about the sea creatures of the Ediacara Biota by Jim Shelton, Yale University, October 6, 2016 http://news.yale.edu/2016/10/06/cementing-theory-about-sea-creatures-ediacara-biota Ancient ocean quirk left us these bizarre fossils By Jim Shelton, Fossils, Yale University, October 11, 2016 http://www.futurity.org/fossils-oceans-1268312-2/ Tarhan, L. G., A. V. S. Hood, M. L. Droser, J. G. Gehling, and D. E.G. Briggs, 2016, Exceptional preservation of soft-bodied Ediacara Biota promoted by silica-rich oceans Geology, G38542.1, first published on October 3, 2016, doi:10.1130/G38542.1 http://geology.gsapubs.org/content/early/2016/10/03/G38542.1.abstract https://gsa.confex.com/gsa/2016AM/webprogram/Paper286584.html GSA Data Repository 2016325 ftp://rock.geosociety.org/pub/reposit/2016/2016325.pdf Also, there is: Joel, L. 2015, How Did Fragile Early Microbes Become Fossils? Eos, August 12, 2016 https://eapsweb.mit.edu/news/2016/how-did-fragile-early-microbes-become-fossils Yours, Paul H.-
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I'm a bit confused with terminology. I always assumed that the fine micro crystalline wood was made through replacement, and therefore the micro structure was very fine, and the specimen was very hard..Picture 1 Where as the coarser fossil wood was formed through silicification and this wood is generally softer and younger than specimens formed by replacement.Picture 2. ( In fact, when looking at the specimen in picture 2 in hand, it is hard to believe this isn't just wood, although it does have pockets with crystals (picture 3). ) Are there obvious features to determine replacement versus silicification, and are older specimens more likely to be formed through replacement, as it seems to be more durable and less likely to degrade?