How to Identify Shell Fossils
- 1). Look carefully at the shell, and consider its weight. True fossils are rocks and will be much harder and heavier than shells.
- 2). Analyze the overall shape. Fossil shells may be circular, egg-shaped, cup-shaped, tubular or spiral. Spiral shells are often snail fossils or ammonites.
- 3). Look at the orientation of the shell. Some brachiopod shells are biconvex, which means both sides of the shell curve outward. Examine the hinge of the shell, if it has one. Some hinges are flat; others are pointed.
- 4). Examine the surface of the shell. Patterns on the shell are called decoration, and they can be useful in identifying species.
- 5). Use a simple yes-no system to help identify shell fossils with the aid of a fossil field guide. Through the process of elimination, you can narrow the list of species that a particular fossil represents.
