Fossil wood, 4x6 cm
Very nice fossil wood disk, polished.
Age: Triassic
Locality: Madagascar
Size: 4 x 6 cm
Araucarias are conifers with hard, pointed, blade-shaped leaves. Today they are only found in South America and Oceania, which is a relic of their distribution on the southern primeval continent of Gondwana, which later split into South America, Africa, India, Antarctica and Australia.
The wood fossilized by being saturated with siliceous water in the absence of oxygen. The silica precipitated in the interstices as quartz, chalcedony or opal and replaced the wood, which was slowly decomposed by anaerobic bacteria. The coloration was provided by other minerals in the water, mostly iron oxides.
The photo is a sample image. You will receive a specimen of comparable quality.
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