This is a rangeomorph holdfast from the Ediacaran of the Flinder's Range in Australia.
It is labeled as Medusinites mawsoni, as it was believed to have belonged to a jellyfish, but this is now not considered to be true, and is likely similar to Charniodiscus in being the holdfast for a member of the Vendobionta, probably a fractal rangeomorph like Charnia.
This is therefore Precambrian in age, somewhere between 550 to 560 million years old or so.
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