A five-year-old schoolgirl discovered a rare 160million-year-old fossil while digging beside a lake using a plastic spade.
Delighted Emily Baldry found the Jurassic period rock at Cotswold Water Park in Gloucestershire while on her first archaeological dig with dad Jon.
And the 130lb fossil, which she has named Spike, has now been restored to its full splendour by palaeontologist Neville Hollingworth.
'It's so exciting to see him,' said Emily, from Chippenham in Wiltshire, on being reunited with the ammonite. 'I was very happy when I first saw him and now he looks very shiny.
'I bring him into school and all my friends like him too.'
She yesterday presented the fossilised sea creature, which is 40cm in diameter and has 2cm spikes, to the Gateway Information Centre near Cirencester, Gloucestershire. Read more.