This plaque is not part of the Fossil Sculpture Trail. It was made to celebrate the finding of the very complete remains of a fossilised plesiosaur in 1851. The find was in one of Barrow's many lime quarries. Two plaques were made. One was placed on the monument on Jerusalem Island at junction of South Street and High Street. The other is on the club house of Barrow Town Cricket Club off Nottingham Road.

Plesiosaurs were huge reptiles that lived in the warms seas that covered Barrow between 180 and 200 million years ago. This particular plesiosaur was called Rhomaleosaurus megacephalus: literally "strong lizard with a big head". It had a short body, a long neck and four strong flippers used to "row" itself through the water. It probably hunted its prey rather like a killer whale does today.

A life sized model of this find is laid into the floor in Charnwood Museum. It is well worth a visit.