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  2. Ammonoidea - Wikipedia

    en.wikipedia.org/wiki/Ammonoidea

    Fossil of Parapuzosia seppenradensis, one of the largest known ammonites. The smallest ammonoid was Maximites from the Upper Carboniferous. Adult specimens reached only 10 mm (0.39 in) in shell diameter. [36] Few of the ammonites occurring in the lower and middle part of the Jurassic period reached a size exceeding 23 cm (9.1 in) in diameter.

  3. Korite - Wikipedia

    en.wikipedia.org/wiki/Korite

    The firm's sister company, Canada Fossils Ltd., provides it with ammonites and other fossils. It is a member of the American Gem Trade Association. On September 27, 2007, an ammonite fossil 80 million years old and 60 cm (two ft) in diameter of ammonite made its debut at the American Museum of Natural History in New York.

  4. Ammolite - Wikipedia

    en.wikipedia.org/wiki/Ammolite

    An iridescent ammonite from Madagascar Map of North America highlighting the shallow inland sea present during the mid-Cretaceous period. Ammolite comes from the fossil shells of the Upper Cretaceous disk-shaped ammonites Placenticeras meeki and Placenticeras intercalare, and (to a lesser degree) the cylindrical baculite, Baculites compressus.

  5. Dactylioceras - Wikipedia

    en.wikipedia.org/wiki/Dactylioceras

    Dactylioceras was a widespread genus of ammonites from the Lower Jurassic period, [1] approximately 180 million years ago . [2] and Like many other ammonites, the genus Dactylioceras is extremely important in biostratigraphy, being a key index fossil for identifying their region of the Jurassic. It had a nearly cosmopolitan distribution during ...

  6. Acanthoceras (ammonite) - Wikipedia

    en.wikipedia.org/wiki/Acanthoceras_(ammonite)

    Acanthoceras fossils have been found in Australia, Brazil, Bulgaria, Colombia (Hondita Formation, Prado, Tolima), [2] Denmark, Egypt, Morocco, France, Germany, India ...

  7. Douvilleiceras - Wikipedia

    en.wikipedia.org/wiki/Douvilleiceras

    Douvilleiceras is a genus of ammonites from the Middle to Late Cretaceous. Its fossils have been found worldwide, in Africa, Asia, Europe, and North and South America.

  8. Arietites - Wikipedia

    en.wikipedia.org/wiki/Arietites

    Arietites bucklandi fossil at the Geological Museum in Copenhagen. Arietites is a genus of massive, giant evolute, psiloceratacean ammonites in the family Arietitidae in which whorls are subquadrate and transversely ribbed and low keels in triplicate, separated by a pair of longitudinal grooves, run along the venter. Fossils are known world ...

  9. Crioceratites - Wikipedia

    en.wikipedia.org/wiki/Crioceratites

    A rare heteromorph ammonite fossil from the south of France. The species is Crioceratites nolani and the spines have been partially restored to show how it might have appeared in life. Crioceratites is an ammonite genus from the Early Cretaceous belonging to the Ancyloceratoidea.

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