The bones were collected, analysed and described in research carried out at the New Mexico Museum within a year of the discovery.
More recent research, however, has determined the fossil belonged to a brand new species of dino.
Even without access to a full skeleton – the researchers only had parts of the skull, ribs and limbs – the researchers knew they had struck gold.
The beast was promptly named after the rock formation where it was discovered, the Menefee Formation.
The second part of its name, sealeyi, was picked in honour of Paul Sealey who originally unearthed the fossilised bones.