Feeding on aspen bedding

Hello,

I asked this question in another thread but I think it got over looked ::)

What are the different "types" of aspen when everyone refers to "Aspen bedding"?
I have been using the "shavings" type aspen with no problems. recently I acquired 2 large bags of "aspen bedding" but has is much smaller pieces (more like chewed up tooth picks for lack of a better description). what (if any) type would this be considered and is it ok to use? It is a little bit dusty but I can blow that out with a fan.

Thanks

Jim