 They may have provided support for the vertebrae, or perhaps prevented the blood vessels from being crushed if the animal's heavy tail pressed against the ground.These "double beams" are also seen in some related dinosaurs.Chevron bones of this particular form were initially believed to be unique to "Diplodocus"; since then they have been discovered in other members of the diplodocid family as well as in non-diplodocid sauropods, such as "Mamenchisaurus".