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Such shells have three distinct layers and are composed mostly of calcium carbonate with only a small quantity of protein--no more than 2 percent. These shells, unlike typical animal structures ...
Ancient plant fossils that puzzled scientists have turned out not to be plants after all, new research has revealed. Instead, the small round shapes bearing a leaflike pattern were once the shells ...
When Colombian priest Padre Gustavo Huertas found two small, round rocks with leaf-like patterns sometime between the 1950s and 70s, ... they were baby turtle shells.
The shell itself is made from broadened and flattened ribs, fused to parts of the turtle’s backbone (so that unlike in cartoons, you couldn’t pull a turtle out of its shell).
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