The first remains were found in a bonebed discovered in 1989, which produced numerous ribs and vertebrae from the back and tail, as well as many limb bones, but no skull material aside from one tooth. Four osteoderms of different sizes and shapes were also recovered from this bonebed. This material comes from several different individuals. Since 1989, more material has been uncovered in the same region of France, including a relatively complete skeleton with some elements of the skull and lower jaw.