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Line 2:
Line 2: − − Ammonites are excellent [[index fossils]], that is, their fossils will often give an age to the rock layer in which they are found. − − Although Ammonoids were present from the late Silurian, Ammonites were at their height in the Jurassic.
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Ammonites are an extinct group of marine [[Cephalopod]] [[Mollusc]], belonging to the subclass [[Ammonoidea]] in the class Cephalapoda, which belongs in the phylum Mollusca.
Ammonites are an extinct group of marine [[Cephalopod]] [[Mollusc]], belonging to the subclass [[Ammonoidea]] in the class Cephalapoda, which belongs in the phylum Mollusca.
[[Category:Biology]]
[[Category:Biology]]
[[Category:Extinct species]]
[[Category:Extinct species]]