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ammonoid
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ammonoid

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Polished cross section of a Middle Jurassic ammonite from southern France; in the Eichstätt …
(credit: Lilly Stunzi-Zurich-New York)
Any of a group of extinct shelled cephalopods, related to the modern pearly nautilus, that are commonly found as fossils in marine rocks of the Devonian through Cretaceous periods (410–65 million years ago). Most ammonoids were predators. The shells, either straight or coiled, served as protective and supportive structures and enabled the animals to compensate for varying water depths. Ammonoids are important index fossils because of their wide geographic distribution in shallow marine waters, rapid evolution, and easily recognizable features. See also belemnoid.

ammonoid [′a·mə‚nȯid]
(paleontology)
A cephalopod of the order Ammonoidea.
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278 QE665 The warm climate and floods of the Devonian period produced fishes, ammonoids, and reefs but it also accommodated two of the biggest mass extinction events ever.
Devonian events and correlations by SciTech Book News
Coprolites containing ammonoids from the Devonian of New York.
Detecting avian predation on bivalve assemblages using indirect ... by Stempien, Jennifer A. / Journal of Shellfish Research
Aguathuna, just west of Port au Port, is a world-class fossil area where you can see ammonoids, graptolites and clam burial sites.
Southwest Newfoundland by Rogers, Barbara Radcliffe; Rogers, Stillman / Canada's Atlantic Provinces Adventure Guide
 
 
 
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