Doushantuo type preservation
The preservational mode of the Doushantuo formation involves very early phosphatisation on a cellular level - with cells being replaced by phosphate before they degrade.[1]
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[edit] Occurrence
The mode of preservation is typically found in shallow, high energy waters, as lenses of phosphate in carbonate rocks.[1] Its occurrence is assisted by high concentrations of phosphate, which are presumably led to precipitate around the degradation products of cells and cell walls.[1]
[edit] What is preserved
Cells are preserved at a cellular level, with arguments that sub-cellular structures may even represent cell nuclei.
[edit] Bias
Although the preservational window is open pretty continually from about 580 million years ago[verification needed] through most of the Cambrian, it tends to preserve microscopic things, such as embryos and bacteria.[1]
[edit] References
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