Fig 1: Femoral paleohistology of Choyrodon MPC-D100/803.(A) complete section from the periosteal surface (top) to approximate center of medulla (bottom) with sections delimited showing areas of close-up bone microstructure; (B) outer cortex composed of more organized woven-fibered tissue with plexiform to laminar vascularity; (C) transition zone between highly disorganized, woven-fibered bone tissue with reticular vascularization and a the more organized woven-fibered tissue with plexiform to laminar vascularization; (D) mid-cortex with secondary osteons (Haversian systems); (E) inner cortex bearing erosion rooms. All sections under polarized light; scale bars as noted on subsections. Images captured on a Nikon Eclipse Ci-Pol microscope. Study sites: er, erosion rooms; po, primary osteon; so, secondary osteon (Haversian system); tz, transition zone. Photograph credit: Lindsay Zanno.