NEW YORK -

Two fossilized dinosaur skeletons found on a Montana ranch in 2006 are coming up for sale in New York City.

The nearly complete skeletons are billed as the "Montana Dueling Dinosaurs."

They'll be offered as a single lot on Nov. 19 at Bonhams. The auction house estimates it could bring $7 million to $9 million.

Bonhams says the dinosaurs -- a plant eater and a meat-eater -- appear to be locked together in mortal combat.

They're being sold by the owners of the ranch where the fossils were found. It's located in the fossil-rich Hell Creek formation, where dinosaurs once roamed.

Each of the specimens is well preserved.

Paleontologists believe one may be a close relative of T. rex. The other may be a new species similar to a Triceratop.