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However, there is yet little unequivocal paleontological evidence of Precambrian sponges.Here, we present a newly discovered 600-Myr-old fossil preserved at cellular resolution, displaying multiple poriferan features.The animal was covered with a dense layer of flattened cells resembling sponge pinacocytes, displaying a hollow tubular structure with apparent water inflow and outflow orifices.Although requiring additional specimens of similar form for confirmation, this finding is consistent with phylogenomic inference, and implies the presence of eumetazoan ancestors by 60 Myr before the Cambrian. nov.) is slightly more than 1.2 mm wide and 1.1 mm tall, is composed of hundreds of thousands of cells, and has a gross structure consisting of three adjacent hollow tubes sharing a common base.Phylogenomic extrapolations indicate the last common ancestor of sponges and eumetazoans existed deep in the Cryogenian, perhaps 200 million years (Myr) before the Cambrian (541 Ma).This inference implies a long Precambrian history of animals phylogenetically allied with sponges.This is a little awkward, but the context makes things clear.

We don't have a problem with the weirdness of historical time--in 2012, we can easily say that an event in 200 BCE happened 2211 years ago and that an object made back then is 2211 years old today.

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(Remember, there was no year 0.)Among geologists, a widespread practice has arisen in the last few decades that gives dates (not ages) in the format " "5 Ma" is a point in time that is 5 million years from the present.

Instead of saying that the rock is "5 Ma old," geologists use a different abbreviation like m.y., mya, myr, or Myr.

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