Brachiosaur spines?

[The Armadillo with the Mask <armadilo@daft.com>]

Paging through the "Complete Dinosaur" at breakfast this morning(Wonderful
book BTW, all of you who had a manus in it) and came
across GSPaul's piccys of Brachiosaur herds with spines going down the
neck. This is the first time I've seen a brachiosaur or possibly any
sauropod rendered with these. Obviously Greg wouldn't have rendered them
this wayt if there wasn't SOME evidence for it. Is this a relatively
recent discovery or is it more like the Parasauroplophus neck-flap?

(BTW, if the person who did the color plate in "Complete" of the
Parasaurolophus is out there and you are selling prints of this, please
drop me a message with how much you want for them. Accurate or not, its
really a beautiful piece)

---Steve