skittering and fans

Candy   Thu Aug 10, 2006 6:49 am GMT
In this passage:

"She leaned closer to the wall, which today seemed a hairy web of roots and skittering stones, and soil falling in soft dry fans upon the granite floor."

My dictionary says "skitter" means "to dart or run quickly and lightly. And as I know a fan is a device for creating a current of air. But what are "skittering stones" and "soft dry fans" mentioned here?