Yep Sleek, it's landscape gravel. I've got a couple landscape supply places that will let me pick through their pile.
Deerhunter, that seems like a good definition to me. It aint always round over all but it has rounded corners due to tumbling and movement by liquid and or solid frozen water.
Landscape gravel is screened to obtain consistent size pieces that are small enough to pick up with one hand, but unscreened gravel can be pretty big like the size of a basket ball.
Bjrogg, that's home made gravel on a smaller scale than what mother nature does and lacking millions of years of tumbling, but close enough for me.
Gravel ROCKS!