2.6" Wide, Cretaceous Ammonite Fossil Association - Australia

This is an ammonite of the species Australioceras jackii that preserved in association with a heteromorph ammonite that's likely of the genus Taxoceratoides sp.?. The rock surrounding this ammonite has almost completely been removed, though a section of the rock remains to hold the two ammonites together in their preserved state. These ammonites are Early Cretaceous, Albian Stage or approximately 110 million years old.

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While most ammonites have spiral shells that retain the same shape throughout life, heteromorph ammonites have uncoiled shells. They likely had a different mode of life than other ammonites as the uncoiled shape would have slowed down swimming.

Ammonites were predatory cephalopod mollusks that resembled squids with spiral shells. They are more closely related to living octopuses, though their shells resemble that of nautilus species. True ammonites appeared in the fossil record about 240 million years ago during the Triassic Period. 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.

Australioceras jackii & Taxoceratoides sp.?
Walsh River, Queensland, Australia
Ammonite cluster 2.6" wide
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