field geosciences teaching module: geoparks and geosites geopark naturtejo meseta meridional fossil...
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![Page 1: Field Geosciences Teaching Module: Geoparks and Geosites Geopark Naturtejo Meseta Meridional Fossil trees of Vila Velha de Ródão: How these fossils do](https://reader038.vdocuments.net/reader038/viewer/2022110319/56649c7b5503460f9492f573/html5/thumbnails/1.jpg)
Field Geosciences Teaching Module: Geoparks and GeositesGeopark Naturtejo Meseta Meridional
Fossil trees of Vila Velha de Ródão: How these fossils do enable to
recognize climate changes?
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Geological Map of Naturtejo Global Geopark
Paleontological findings
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Paleontological findings
The fossil trunks were found on the Monte do Pinhal terrace (T1) from Tejo river:
• It is the oldest (1,6 million years old)
• It has the highest position in relation with present riverbed (181m)
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Fossil Trees of Vila Velha de Ródão in the Fossils Garden
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Fossilization
After the death of the tree it was buried and the cells composing the plant fibres were filled by silica coming from dissolved silicate sediments - Permineralization.
Thousands of years
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Silicified trunk
Why do the trunks have such color?
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The fossils are older or the same age as the sediments where they were found?
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Age of the fossil trunks
Natural polishing of the fossil Collision marks with pebbles
• Fossil trunks were transported as clasts among high energy river bed load and deposited in the river terrace
• Thus, fossil trunks are older than the fluvial terrace, with na estimated age between 15 to 5 million years old.
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These trees share the features of the same tree attributed to Annonoxylon teixeirae, whose present best known representative is the Annona-Tree
Where can you find Annona-trees in the wild forests nowdays?
In which type of climate?
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Present distribution of Annonaceans
Hot and humid latitudes
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Paleoenvironment of Naturtejo Geopark 15-5 million years ago
Hot and in some periods more humid climate
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