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Well thank you very much, but I do not have an account to see the rest of the article you posted. Does the genome comparision provide a mechanism for determining the time of divergence from the hypothetical common ancestor or is it an assumption?

No, I gather they assume the time divergence from the fossil evidence. The original post contended there was a lack of evidence linking vertebrate and invertebrate evolutions. The paper I cited I highly recommend; many public libraries carry Science. They do a very systematic job of identifying genes in Ciona which are present (often in many diverged copies) in vertebrates; genes that are present in protostome invertebrates (mollusks, arthropods, etc) and in Ciona, but not in vertebrates; and genes that seem to be missing entirely in Ciona. Obviously, if you don't believe in evolution, you're going to be trying to explain away all of these homologies; but reading this paper will at least convince you of the sheer volume of evidence that has to be explained away, and the nonsense of saying that there's no evidence of links between invertebrates and vertebrates.