Originally Posted by Banjo
In your second picture, it looks like you scratched a squiggly in it somehow...maybe with your nail or something? Anyhow, does that mean what we see is a film? If so, it probably due to early season snowmaking that often has a bunch of crap in it that sticks to your board. Thats my best guess as I have had a film form on the bottom of boards after sessions at the local park that is 90% man made snow.
I saw that too. If that's the case, try taking a metal scraper to it to see if it comes off.