Yes. One also gets quite a variety of color when those flints are heat treated. No flint in this region at all, but do have a bit of chert. Tough to work, but a little heat can bring it around. Truck loads of obsidian though and it's the easiest of all the materials to work. Have lots of black cobbles in my back 40, but nothing much bigger than softball size. Need to travel a bit for larger and more colorful chunks.
