Figure 4: Eggshell associated with Beibeilong sinensis (HGM 41HIII1219).

From: Perinate and eggs of a giant caenagnathid dinosaur from the Late Cretaceous of central China

Figure 4

(a) Photograph showing the ornamentation on the outer surface of Macroelongatoolithus eggshell. Scale bar, 2 cm. (b) Photomicrograph showing histological section of Macroelongatoolithus eggshell in radial view shows two microstructural layers (lower mammillary layer and upper continuous layer) demarcated by an undulatory boundary (arrow). Scale bar is 1 mm.