I figured that, I know about the rubble but I hoped there was a way for just the gravel. But, it's not the end of the world. Hehe. But need to look into the instance painter, might as well fiddle with that during the last few days before Light's Will is completed.
The small rocks are a terrain painter thing. I just used it this morning.
Try TR_Rock_Slate_Rubble_* (there are two I use)