Kaili biota | Wikipedia audio article
Channel: wikipedia tts
Date: 07/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Kaili_Formation


00:01:00 Fossils
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SUMMARY
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The Kaili Formation is a stratigraphic formation which was deposited during the Lower and Middle Cambrian (~513 to 506 million years ago). The formation is approximately 200 metres (660 ft) thick and was named after the city Kaili in the Guizhou province of southwest China.
The depositional environment of the Kaili formation is not entirely known, and there are two hypotheses for its formation. It may have been a nearshore marine environment with 'normal' levels of oxygenation; or it may have been a deeper water environment further from the shore, on the open continental shelf; in this setting oxygen would not be available below the surface layers of the deposited sediment. The trace fossil assemblages in the formation suggest that it was below the wave base and was reasonably well-oxygenated.