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Description: | Specimen of a fossil ammonite, Amaltheus stokesi, collected from the Middle Lias rocks of Early Jurassic age from North Yorkshire (NE England).
An ammonite from the Early Jurassic rocks of the Yorkshire coast. This ammonite has a very 'flat' shell, when compared with other ammonites of Jurassic age, such as Cadoceras and Macrocephalites. The ribs on the shell of this ammonite are distinctly curved. If you look closely, you will see that there are extra small ribs along the keel. Ammonites moved by squirting a jet of water through an organ called the siphuncle. Ammonites with sharp keels (like the bottom of a boat) were probably able to move through the water more quickly than rounder shaped ammonites.
The specimen was found in North Yorkshire.
It is from the Jurassic period (206 - 144 million years ago) | Publisher: | Tyne & Wear Archives & Museums | Subjects: | Cephalopoda Classification: Animalia Invertebrata Ammonoidea Mollusca | Temporal: | Jurassic period (206 - 144 million years ago) | Source: | Tyne & Wear Archives & Museums | Identifier: | http://www.twmuseums.org.uk/geofinder/se... | Go to resource |
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