I believe in Darwin's dumb version of God which can't do miracles sums your beliefs, it would seem."Sudden" appearance again clearly doesn't mean miraculous or created, or sudden in human terms.
More rational people would probably not jump to such conclusions.
More rational people would probably note the geological changes indicated in the strata and then look honestly for common ancestors from what was around before. Waving away the evidence because you'd rather believe in miracles is rather a requirement for YECs it seems.