I want to know the answer to the following question:
When did Cloudina exist?
All the background I'm provided with is that "The small shelly fossil Cloudina, from 549 to 542 million years ago, has been classified by some authors as an annelid, but by others as a cnidarian (i.e. in the phylum to which jellyfish and sea anemones belong).". Is that enough to answer the question?