Unaltered hard parts: teeth and very recent shells, bone or shell encased ... crystallizing to calcite, as in fossil snails, or it may be the growth of larger crystals of an existing mineral such as ...

Researchers discover 50-million-year-old animal from Tunisia could crack snail shells with its powerful jaws. The discovery ...

Based on the fossil record, ammonites came in a wide range of sizes and shapes, from smaller than an inch to as large as nine feet wide. Some ammonites had long, straight shells, while others had ...

Fossils of them are found all around the world, sometimes in very large concentrations ... is exceptionally rare and looks a bit like a knot. While ammonite shells are abundant in the fossil record, ...

The fossil that was originally interpreted to be a plant, but researchers have now discovered is the inside of the shell of a baby turtle. Disclaimer: AAAS and EurekAlert! are not responsible for ...

Scientists have found new evidence confirming that turtles once lived without shells. The almost-complete fossil dates back ... "It has a very characteristic beak at the front end." ...