Fig. 1

The raw reconstructed data for the Rhamphorhynchus sp. (OUMNH PAL-J.028331) wing bone scanned on the Nikon XT H. (a) is the whole bone along the longitudinal axis, (b) is an orthoslice near the distal end, which is exposed to air, and (c) is an orthoslice near the proximal end, which was predominantly encased in the sediment. The low-attenuating spheres are silicon balls that were used to reduce beam hardening effects, the central areas with high attenuation are bone structures, and the high-attenuating material beyond the bone is sedimentary matrix.