The Ordovician period was 485.4 to 443.8 million years ago, so there may have been fossils in that layer that were long dead and turned to stone 400 millions years earlier than the slip, and then another 50 million years after that, there are modern humans speculating about the cause of this slippage.
I sort of get why some people are attracted to creationist beliefs about earth being only 6000 years old. Those time spans are dizzying to think about.
Sometimes I will watch an instruction video on YouTube and say "Nope, that's worth paying a professional for". Other times it's very useful, such as when the flame sensor in my furnace needed to be cleaned. It's a wonderful resource, really.