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Fossilized Ammonite Half
from The STEMcell Science Shop
This spiral fossil is the cut and polished shell of an extinct sea animal called an ammonite that lived between 409 to 66 million years ago. Its soft body would have filled the biggest chamberof the shell, while the smaller chambers were used to control buoyancy.
Species: Ammonoidea Era: Devonian–Cretaceous (409–66 million years ago)
Pics are representative of our current inventory. You may not receive the specimens pictured. Approx. 1" diameter
Ammonites were extremely abundant for a very long time until the K-Pg extinction event. They may have squirted ink like modern cephalopods. Since ammonites were so widespread, they are often used by geologists as an index fossil to date the rock in which they are found