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This fossil has beautiful patterns and coils, the ancient creature would grow and continue to build a shell to cover its soft body parts. The creatures would continue to wrap around themselves numerous times and thus the fossils show the growth of the creatures, much like the growth lines on a tree. The agoniatite is a Devonian age variety of ammonite. It is approximately 345 million to 395 million years old. These make beautiful home decorator pieces as well as conversation pieces. Some believe the fossils show cycles and lifetimes, as the coils never end.