This Specimen has been sold.
"Dawn Sunrise" Asteroceras Ammonite Fossil - Translucent
This is a beautifully prepared, 2.4" wide Asteroceras obtusum ammonite fossil from the Lyme Regis region of England. Much of the shell is preserved as a translucent, yellow agate. The rock has been removed from behind this translucent portion of the ammonite so that it shines like a sunrise when backlit. The rock has been cut flat so that it displays very aesthetically without the need for 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.