This Specimen has been sold.
4.3" Cretaceous Ammonite (Calycoceras) - Texas
This is an unusual Calycoceras tarrantense ammonite fossil from the Late Cretaceous Woodbine Formation of Texas. Comes with a display stand.
Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.