Titanosaur Eggshell Pieces. Found in the Sierra Perenchiza Formation of Spain, 70 million years old. You will receive one eggshell fragment. They range in size from 0.4" to around 0.5" in diameter. These are very thick eggshell pieces when compared to all other eggshells. The pictures shown are an example of what you will receive, the size and shape of the fragment you receive will vary.