The surface of the egg was crenelated with the lowest areas oriented along the length of the egg. It is believed that theses structures were necessary for the embryonic release of carbon dioxide gas through pores in the egg. Even though the egg may have been covered by sediments and vegetation, some mechanism was needed for the release of toxic gasses. The crenelations and bumps were believed to have served this purpose by holding the sediments away from the pores.