Fluorescent Petrified Wood

Ever tried shining an ultraviolet light on your fossils? About 60% of fossil shells fluoresce. I discovered one morning as I was admiring my fossil shells this way, that my petrified wood seems to match those statistics.  Below you can see what they look like under visible light. 

Blue Forest Petrified Wood, Eocene, Wyoming

Petrified Cypress Wood, Miocene, Delaware