A really nice partial rib section from the famous hadrosaur Edmontosaurus! 
 
Edmontosaurus was truly huge, measuring up to 12 meters and, weighing up to 5.6 tonnes. Despite its size, the fossil record shows it was one of the preferred prey items of Tyrannosaurus Rex.
 
Specimen information
 
Location: Lance Creek Formation
Age:67 Million Years Old
Length of fossil: 4.78 inches