Continent is better Matt but east coast/west coast and north or south, etc is even better. The density of the wood will help identify it too. Redwood is a very light weight wood so the burl should be too if that's what it is. Redwood is also soft. You should be able to scratch the surface with a thumbnail.
As far as uses there are a few. It's hard to tell just how big it is but it could be pretty valuable made into a small table. A high end furniture maker might be interested in turning it into veneer. I've made a number of clocks out of burls. That's just a start on possible uses.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.