Christine Clark, 64, was hunting for fossils during a Boxing Day walk on Holy Island, Northumberland when something caught her eye.
A tiny pebble seemed to be “smiling at me”, she said. “It looked like someone’s fake teeth.”
She took it home and posted it to a Facebook fossil identification page.
Thousands of likes and comments later, others seemed to confirm her suspicion that it was, in fact, an ancient marine animal. {read}