Last edited 01 Oct 2020

Ammonite

Green infrastructure and open environments: London’s foundations: protecting the geodiversity of the capital, Supplementary Planning Guidance, published by the Mayor of London in March 2012, defines ammonite as an: ‘Extinct group of marine animals of the subclass Ammonoidea in the class Cephalopoda, phylum Mollusca. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods. They originated in the late Silurian, were extremely abundant during the Mesozoic and became extinct at the end of the Cretaceous.’

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