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This
is an ammonite, discovered in a local garden. Ammonites are often found
in the chalk which underlies the area. This is because the South Downs
were once a warm sea. Sea creatures like this shellfish fell to the sea
bed when they died and gradually compacted into chalk. This happened up
to one hundred million years ago during the Cretaceous Age. Later the
sea bed was lifted up by earthquakes and the shifting continents, which
is why fossilised sea creatures can be found on top of hills!
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