paleonet Early NA hadrosaur specimens??

[Mike Everhart <mike@xxxxxxxxxxxxxxxxxx>]

All,
Since the recent discovery of hadrosaur remains (scrap) in the Smoky 
Hill Chalk
http://www.oceansofkansas.com/New-dino.html

...I've been trying to find other records of contemporary or older 
specimens for comparison. I came across a comment by Donald Glut (1972) 
that suggested that Marsh's specimen of "/Claosaurus/ has the 
distinction of being the oldest known hadrosaur of North America." 
Carpenter, et al. (1995) noted that "because of it's age, this animal 
has come to take on an important role in the phylogeny of these 
dinosaurs..." (citing Lull and Wright, 1942, and Ostrum, 1961).

The new specimen may be as much as 2 million years older... (Upper 
Coniacian vs. Lower Campanian)

I would appreciate any information / suggestions regarding more recent 
references to early hadrosaurs from North America.

Regards,

Mike Everhart
Adjunct Curator of Paleontology
Sternberg Museum of Natural History
Fort Hays State University, Hays, KS
www.oceansofkansas.com