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Ammonites came in a range of sizes, from just a few millimetres to times bigger, with larger sizes more common from the Late Jurassic onwards. The largest known species of ammonite is Parapuzosia seppenradensis from the Late Cretaceous. The largest specimen found is 1.8 metres in diameter but is also incomplete.
Diagnostic characters. Ammonites (subclass Ammonoidea) can be distinguished by their septa, the dividing walls that separate the chambers in the phragmocone, by the nature of their sutures where the septa join the outer shell wall, and in general by their siphuncles .
Ammonites were ancient marine predators with coiled shells that survived three mass extinctions until the end of the Cretaceous period. Learn about their appearance, behavior, evolution, and how they are used as index fossils to date other fossils.
Ammonite is a 2020 romantic drama film written and directed by Francis Lee. Loosely inspired by the life of British palaeontologist Mary Anning , played by Kate Winslet , the film centres on a speculative romantic relationship between Anning and geologist Charlotte Murchison , played by Saoirse Ronan .
Ammonites: fossil focus. (Nottingham, UK: British Geological Survey.) Ammonites lived during the periods of Earth history known as the Jurassic and Cretaceous. Altogether a time interval of about 140 million years.
7 Dis 2021 · Ammonites are a type of cephalopod that thrived in the oceans during the Mesozoic Era. They became extinct at the same time as non-avian dinosaurs about 66 million years ago. Scientists have learned a lot about these marine animals through their fossils - their hard shells are a common find on beaches and in rocks.
Learn about ammonites, extinct cephalopods with chambered shells, from the Paleozoic and Mesozoic Eras. Find out their diversity, evolution, ecology, and geologic significance.
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