5.6" Ammonite (Dactylioceras) Fossil Cluster - England

This is a classic British ammonite cluster of the species Dactylioceras commune. These well preserved ammonites are Jurassic in age and are found in hard concretions that must be split open to reveal the fossils. One edge of one of the ammonites shows a metallic luster due to partial pyrite replacement. The hard rock then has to be removed mechanically to further expose the fossils.

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.
Dactylioceras athleticum
Kettleness, Nr. Whitby, North Yorkshire, England
Upper Lias - Semicelatum Subzone
Entire specimen: 5.6 x 4.7", Largest ammonite: 2.9" across
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