And I never thought I'd have an opportunity to post my arrowhead collection. Don't laugh, I made it when I was 8. Actually there's only one arrowhead (2 inches tall), the rest are pieces arrowheads and bits of knives... I have no idea how old they are, I used to collect with my uncle in North Park, CO when I was a kid. We used to find them around the dunes that sit along the base of the Medicine Bow Range. My grandparents have a box full of sharks teeth that they collected there in the 60's. Keep in mind, this is 10,000 ft elevation... sharks teeth.