Fossils of them are found all around the world, sometimes in very large concentrations. Ammonites were shelled cephalopods that died out about 66 million years ago. Ammonites were marine animals belonging to the phylum mollusca and the class cephalopoda.
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Ammonite shells are used today as index fossils, meaning they can help date other fossils that are found in the same layer of marine rock. Ammonoidea, or ammonoids, constitute one of the most important clades of extinct invertebrate animals. These spectacular looking marine animals thrived in the paleozoic and mesozoic eras, which.
They had a coiled external shell similar to that of the modern nautilus.
Discover the fascinating world of ammonites — extinct marine cephalopods. Learn about their evolution, shell structure, fossilization, and role as key index fossils in geology. Despite being creatures which occur so commonly as fossils that it seems like we should know everything about them, ammonites are creatures fraught with uncertainty for artists and. Their lovely shells have long made them favorites of collectors and their fossils have.
Explore the captivating story of ammonite fossils, from their unique characteristics to their global distribution, and learn how these extinct creatures continue to captivate scientists and. Ammonites are a distinctive class of extinct invertebrates within the phylum mollusca.
