Figure 17 -- A biface under dynamic loading conditions that will yield a hinge flake. The red represents the loading time of 0.0002 seconds. The blue is one cycle of free response (0.002481 seconds) of the core after the crack initiates. At the beginning of the free response, notice the core continues in the same direction it was moving during the loading time. After it reverses its direction, there is a quick, double reversal before it reaches the at-rest-position. This double reversal or hiccup creates the hinge termination. This biface is 3 inches wide by 0.4286 inches thick and fixed at the edge opposite the platform.

These measurements yield a width-to-thickness ratio of 7. This is extremely thin, but not without precedence in the archaeological record. Some of the thinner Solutrean laurel leafs have width-to-thickness ratios even higher than 7.0.