Phillips is full of it. There are a large number of bones that have not even been categorized or examined in a storage facility at some university (Texas?) from the Cope and Marsh days.
There are loads of dinosaur bone fragments over large areas of utah, etc. Illegal to pick them up, but mainly plant eater dino bone frags just eroding away on the surface of the ground...
But that is a subject for another day. See the book Tyrannosaurus Sue by Steve (forgot the last name). I have read the book and actually knew at one time some of the Black Hills guys.
As you can probably tell, paleontology is a hobby of mine.
Rectitudine Sto. Sauropod