Ammonites
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Tropaeum

Tropaeum was a big ammonite from the Lower Cretaceous. It was loosely coiled, and it might have turned back towards its body. Its radial ribbing pattern was unusual, as it started off with packed bump-like ribs, then densely packed fine ribs, then finishing with large, distinct, well-spaced ribs around the living chamber.

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Image by Apokryltaros at English Wikipedia, CC By 3.0 and GFDL, https://commons.wikimedia.org/wiki/File:Tropaeum_imperator.JPG
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