Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. However, we know a lot about them because they are commonly found as fossils, formed when the remains or traces of the animal became buried sediment that later solidified into rock. Originally Answered: Why did ammonite go extinct? Ammonites were prolific breeders, lived in schools, and are among the most abundant fossils found today. The scientists found that the distribution of Eutrephoceras was as broad as that of the most widely distributed Ammonites at the end of the Cretaceous. Scientists use the various shapes and sizes of ammonite shells that appeared and disappeared through the ages to date other fossils. Ammonites went extinct at the end of the Cretaceous Period. The final catastrophe occurred at the end of the Cretaceous period when all species were annihilated and the ammonites became extinct.
These molluscs, commonly referred to as ammonites , are more closely related to living coleoids i.
Most ammonoid genera became extinct at the end of that period, but a few survived and evolved into many diverse forms during the Cretaceous Period. Why did ammonites become extinct whereas nautiloids survive the K-T mass-extinction? The ammonites became extinct at the end of the Cretaceous Period, at roughly the same time as the dinosaurs disappeared. This event apparently coincided with the death of the dinosaurs. Ammonites began life as tiny planktonic creatures less than 1mm in diameter.
Ammonites were prolific breeders, lived in schools, and are among the most abundant fossils found today. They went extinct with the dinosaurs 65 million years ago.
While there is currently no definitive answer, it would appear that after the impactor at 65 million years ago struck the Yucatan, the world wide results of this had cataclysmic effects on the entire planet. How did ammonites live? They went extinct with the dinosaurs 65 million years ago. How did ammonites become extinct? However, even the most geographically dispersed Ammonites became extinct in the Palaeocene, whereas Eutrephoceras survived. Ammonoids characterized by a more highly folded suture, called ceratite, replaced the goniatites and were most abundant in the Triassic Period (252 million to 201 million years ago). they were extinct because of the air pressure What period in which the last ammonites became extinct?
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