They concede that there actually was an Upper Jurasic period, but it occurred around 2348 BC (Note that it's one year, not a range!). Of course, the Cambrian was a few months earlier than that!
The article cites the Cambrian period which occurred 490 to 543 million years ago.
How does this fit in with the supposed (unlikely) “young” 6,000 year-old earth theory?
Sounds like the “just-so” YEC crew just shot themselves in the foot.
They concede that there actually was an Upper Jurasic period, but it occurred around 2348 BC (Note that it's one year, not a range!). Of course, the Cambrian was a few months earlier than that!