Figure 30. Dinosaur eggshells. (A-B, E) Fusioolithus sp. eggshell fragment (MPM 21543). A, external view; B, radial section; E, radial section showing the microstructure of the sample. (C-D, F) Prismatoolithidae eggshell fragment (MPM 21551) (C) external view; (D) radial section; (F) radial section under MEB showing three main structural layers: mammillary, prismatic and external. Abbreviations: CL, continuous layer; ML, mammillary layer. Scale bar 1 mm in A-E, 200 μm in F.