Table 1. Three fracture categories applied to MH1 and MH2 (Fig. 7).

Fracture Class	Definition	Characteristics
I	Diagnostic fractures of blunt force injury. Fresh (organic) bone, with well preserved, clear microscopic morphology.	Low velocity impact, plastic deformation – consistent with a dynamic load (Figs 2 and 3).
II	Highly consistent fractures of blunt force injury. Outline and location are typical of in vivo breakage, but fracture mode and dynamics cannot be conclusively substantiated.	Tension/compression markers cannot be identified, but the fracture morphology and anatomical pattern are highly consistent with those observed in common, modern-day injuries (Fig. 4, compare Fig. 5). Also see Fig. 6.
III	Dry, static bone fractures not consistent with perimortem blunt force injury.	Sedimentary pressures and other post-depositional changes (Fig. 1).