1.7" Ammonite (Asteroceras) Fossil - Glows When Backlit!

This is a beautifully prepared, 1.7" wide Asteroceras obtusum ammonite fossil from the Lyme Regis region of England. The ammonite has been prepped mostly free from the rock, with a viewing window that has been sculpted from the limestone. Much of the shell is preserved as a translucent, yellow calcite. During preparation the rock has been removed from behind the ammonite so that it can be back-lit with a light source causing it to glow. It comes with an acrylic 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.

What an ammonite would have looked like while alive.
What an ammonite would have looked like while alive.
Asteroceras obtusum
Black Ven, Charmouth, Lyme Regis, Dorset, England
Lower Lias, Obtusum Zone
Ammonite 1.7" wide. Entire specimen 7.7 x 3.4"
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