Fossil eggshell SEM images

Elongatoolithus sp., Prismatoolithus levis and Gobioolithus minor secondary electron images. Note rugged grain boundaries in continuous layers.长形蛋属未定种（Elongatoolithus sp.）、光滑棱柱蛋（Prismatoolithus levis）以及小型戈壁蛋（Gobioolithus minor）的扫描电子显微镜二次电子图像。注：连续层内可见粗糙的颗粒边界。