SIappendixFigS5

Supporting information Fig. S5. SEM images and elemental composition of the ventral (visceral) surface of one of the eggshells of Testudoolithus oospp., as well as the rock matrix that covers most of the shell bones and some of the eggs. A, ventral surface of the eggshell, showing small circular bumps interpreted as the organic cores of shell units; B, SEM and elemental composition analysis of a region of the ventral surface of the egg (see rectangle “B” in A), details of the composition are given in the table below A, indicating high carbon content. C, photograph showing the rock matrix covering most of the shell bones and some of the eggs; D, SEM and EDS analysis of the rock matrix (see rectangle “D” in D), details of the composition are given in the table below C, with absence of carbon and abundant contents of silica, aluminium, and iron.