19.6" Hadrosaur (Hypacrosaurus) Ulna with Metal Stand - Montana

This is a large, 19.6" long Hadrosaur (Hypacrosaurus sp.) ulna bone from the right arm, collected from the Two Medicine Formation of Montana. It was collected this last spring and has been nicely prepared from the hard rock surrounding it.

There are multiple repaired cracks through the diaphysis. The largest repaired cracks (one near distal epiphysis and one near proximal epiphysis) required gap fill restoration where the bone crumbled or wasn't recovered. There is restoration in two spots near the proximal end where bone was missing and restoration was necessary for stability. Each epiphysis is weathered, with the most significant weathering at the proximal end where both the olecranon and medial-proximal processes have weathered away.

Comes with the pictured custom metal display stand.

Hypacrosaurus is a very large, Lambeosaurini Hadrsosaur that would have been almost as large as the Tyrannosaurs that it lived alongside. Like Corythosaurus, it had a tall, hollow rounded crest, although not as large and straight. It is known from the remains of two species that spanned 75 to 67 million years ago, in the Late Cretaceous of Alberta, Canada, and Montana, United States, and is the latest hollow-crested duckbill known from good remains in North America. It is estimated to have been around 9.1 meters (30 feet) long and to have weighed up to 4-5 tons.

 Hypacrosaurus drawing by wikipedia user debivort. Creative Commons License
Hypacrosaurus drawing by wikipedia user debivort. Creative Commons License

Hypacrosaurus sp.
Pondera County, Montana
Two Medicine Formation
19.6 x 4", 16.8" tall on stand
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