i'm in san fran for a couple of weeks before flying home to australia. is there any rock to be found in the region here? i would like to get some and take
it home with me so i can start having a go at this knapping thing. we don't have much in the way of knappable rock at home so it would be great to get some
here. we are going out to yosemite on the weekend. any rock on the way? thanks from a newbie.
