On Sun, 22 Mar 2009 22:59:44 -0400, dk wrote:

I have a separation between 2 pieces of wood flooring slats. That slats
run above what I believe is the supporting beam How do I correct this
split?

This sounds like normal cross-grain wood movement. That's why lap,
tounge-and-groove joints or wood laminates are often used. If you
fill in the gap the floor may buckle in the higher humidity season.