Conventional science says that sedimentary rocks form slowly over thousands of years. So how come we find fossilised trees standing upright in quarries? These "polystrate" fossils are excellent evidence of previous global catasrophes, where trees were entirely buried, whilst still standing.

"The immense size of many beds containing well preserved polystrate fossils, also points to rapid catastrophic deposition on a huge scale which does not support millions of years of sedimentary processes."

Here's an very good brochure from the folk at Creation Research.