Different stone yards will call the same type of stone by different names.
As far as the fabric goes try and get a commercial grade material. I know you can get it at White Cap contractor supply in Seattle. I think it goes by the name filter fabric. It is alot less expensive and much heavier, its like felt.
Three or more inches is the general depth.

I realize this is an old posting, but I have some information about Montana Rock  itÂs beautiful stuff, if you can find it, use it.

The colored rock or gravel for landscaping I find is most often called River Rock, and you also want it to be washed for landscaping. The mineral content in different parts of the country will make it more or less colorful. In my limited experience, in the Pacific Northwest river rock from western Montana is much more colorful than other rock, with whatÂs known as Umatilla River Rock being a close second. Here in Seattle all I can find is local stuff which is mostly gray or bagged rock from a company in Rexburg, Idaho, which is nice, but still awfully gray.

Umatilla River Rock can be purchased by the scoop in the Tri-cites area at a landscape supply house, like Beaver Bark in Richland. I don't know of anyone that sells it by the bag. Montana Rock from the Flathead lake area is excellent for maximum color. Getting has become tricky. There was a company in Polson washing and bagging 3/8" pea gravel and 1" Â 2" river rock. I donÂt think heÂs sill in business, thatÂs what I was told about two weeks ago. I did find this weekend a few bags of the pea gravel at my local Home Depot.