Clovis on the left, Folsom on the right. In a nutshell, the flute on a projectile point helped keep the point on a spear shaft.
I’m sure you’ve been just pining to know all about impact fractures and be provided with a somewhat humorous depiction of this occurrence. So, while surveying, I’ve found a lot of broken projectile points in the field, which are then discarded since they can’t be fashioned into a new point. Some of the points broke upon impact with the target, still showing how the tool literally fractured into two or more fragments. Exciting Stuff.
I love a good pun. An exhausted core is a piece of rock that has had so many flakes knocked off of it during the process of flint knapping, that it can’t be used for anything else. So, it gets thrown out. And falls asleep (har har).
Hammerstones can have a real attitude problem, but those cores can have quite the temper.
When a hammerstone and a core fall in love . . .Flint Knapping is the process of using a hammerstone (a small rock/cobble) and hitting it against a type of rock (i.e. a core), like obsidian or chert, that breaks into nice small pieces (i.e. flakes) that can be further worked into tools like scrapers, spear points, projectile points, knives, etc.