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Andrea Gibson, Pansies(via astrolocherry)
the scent of spring
Petrified Forest National Park.
Petrified Forest National Park in Arizona, United States, is named for and is famous for the abundant fossilised wood (Triassic in age) that can be found in the area. As well as the famous fallen trees,other fossils found in the area include Late Triassic ferns, cycads, ginkgoes, and fauna including phytosaurs, large amphibians, and early dinosaurs.
The sediments and fossils that make up the National Park were laid down during the Late Triassic period, approximately 225 million years ago, and the area was situated on the edge of the Super-Continent Pangaea. The climate was humid and tropical-sub tropical (as evidenced by the fossil types found in the area).
So how were these famous trees fossilised?
Periodically the trees were covered in flood deposists containing a large amount of volcanic ash. Overtime Groundwater dissolved silica from the volcanic ash and deposited it as quartz, replacing the organic matter of the trees. Traces of Fe-Oxide in the sediments created the beautiful colours that can be seen today.
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