Fig. 6 in Ecomorphology and bone microstructure of Proterochampsia from the Chañares Formation

Fig. 6. Fibula microstructure of Proterochampsia indet. from the early Carnian Chañares Formation at the Río Gualo locality. A. PULR-V 117, in anterior view; photograph of proximal part (A2), explanatory drawing A1); lines indicate the position of the cross-sections (redrawn from Romer 1972). B. PULR-V 117, cross-section in general view (B1); details (B2, B3), photomicrographs in plane-polarized light; note the fibrolamellar bone (fbl) with primary osteons (po) on the anteromedial surface; secondary osteons (so) and resorption cavities in the mid- to inner cortical region. Abbreviations: a, anterior; l, lateral; p, posterior.