Arcadia Formation, Geological formation in Queensland, Australia
Arcadia Formation is a geological rock layer in Queensland made up of red mudstone, siltstone, and fine-grained sandstone stacked together. The layers reach thicknesses up to 500 meters and display the sedimentary record from the Early Triassic period.
The formation developed during the Early Triassic period roughly 251 to 247 million years ago, immediately following the Permian-Triassic extinction event. This time marks a moment when life on Earth slowly recovered from one of the largest catastrophes in geological history.
Scientists regularly conduct research at this formation to study the recovery of life forms after major extinction events through fossil examination.
The site is accessible for scientific visits but is managed by Queensland institutions and typically requires permission beforehand. Visitors should contact the relevant authorities in advance to clarify access and conditions.
The formation holds rare remains of early amphibians that show adaptation to a world freshly recovering from mass death. These amphibian fossils make up about 90 percent of all the fauna recovered from these rock layers.
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