Ammonites first appeared about 240 million years ago, though they descended from straight-shelled cephalopods called bacrites that date back to the Devonian, about 415 million years ago. Ammonites were prolific breeders, lived in schools, and are among the most abundant fossils found today. Ammonites are very powerful earth fossils. Their spiral shape symbolizes continual change and evolution. They have absorbed cosmic energy over eons of time and help to stimulate the life force (Chi) within. They are often used for activating Kundalini and life path energies.