File:Museo de La Plata - Tronco de conífera petrificado (Gimnosperma).jpg

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Español: Tronco de conífera petrificado (Gimnosperma). Un fragmento de vegetal inmerso en un líquido rico en soluciones minerales es reemplazado por sílice (calcedonia y/u ópalo) o calcita. Este reemplazo de la materia orgánica por mineral, ya sea en el tejido o masivamente en las cavidades, no produce cambios en la forma ni en la estructura original, conservado así una réplica exacta del vegetal. Provincia de Chubut. Antigüedad entre 50 y 60 millones de años.
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Source Tronco de conífera petrificado (Gimnosperma)
Author Beatrice Murch from Buenos Aires, Argentina

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by blmurch at https://www.flickr.com/photos/82439748@N00/3543524848. It was reviewed on 21 May 2009 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

21 May 2009

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current19:33, 20 May 2009Thumbnail for version as of 19:33, 20 May 20093,872 × 2,592 (2.29 MB)Barcex (talk | contribs){{Information |Description= {{es|Tronco de conífera petrificado (Gimnosperma). Un fragmento de vegetal inmerso en un líquido rico en soluciones minerales es reemplazado por sílice (calcedonia y/u ópalo) o calcita. Este reemplazo de la materia orgáni

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