[Renfield]

This geology map doesn't show much from the Cretaceous along the Arizona border; I don't know which formation contained the fossils.

Cretaceous map units have symbols beginnning with "K".

http://www.ut.blm.gov/monument/images/geology/grand_staircase.jpg

[doodad]

That is why I was curious. The Morrison is chock full of dinosaurs esp in Montana area. I just did not think it extended that far to AZ. I have been in this area and so much is sandstone, I did not see a great deal of preservation potential.