A dinosaur leg bone which was found in a Gloucestershire quarry may belong to a rare species, an expert has said.
The palaeontologist who found the bone at Cotswold Water Park near Cirencester says it belonged to a giant, plant-eating reptile called a cetiosauriscus.
Dr Neville Hollingsworth says the creature - which is related to the better-known diplodocus - was 20m (65ft) long when it lived.
BBC Points West's Isabel Webster reports.
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