26.5" Hadrosaur (Hypacrosaur) Humerus with Metal Stand - Montana

 
 
 
 
 
 
This is a large, 26.5" long Hadrosaur (Hypacrosaurus sp.) humerus 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.

Overall this humerus bone is in exceptional condition, requiring relatively little restoration to put it back together. The most significant restoration is in the form of gap fill at the distal end where the bone broke and crumbled at the point of breakage. About half way up the bone there is another crack that resulted in additional fracturing, however the gap fill restoration isn't quite as outstanding. There are other small spots of gap fill restoration and/or fracturing of the bone that required glue stabilization scattered throughout the bone. The distal and proximal ends of the bone have undergone some weathering, revealing the mineral replaced osteons (bone cells & bone matrix).

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

The Two Medicine Formation is a geographical formation in Central Montana and Southern Alberta, Canada. The formation is predominantly sandstone laid down by rivers and deltas during the Campanian Age of the Cretaceous about 80-75 million years ago. Approximately two thousand feet thick on the western edge, it lies on top of the Virgelle Sandstone formation and under the Bearpaw Shale. It is located between the Front Range of the Rocky Mountains and the Sweetgrass Arch, a tectonic fold feature 40-90 miles east of the Front Range.

The Two Medicine is the same age as the Judith River Formation found further east. It was laid down further inland from the Western Interior Seaway, while the Judith River Formation was deposited along the coast. The Two Medicine contains much of the same dinosaur fauna, but fewer reptiles, amphibians and aquatic fossils.

A view of the Two Medicine Formation quarry operated by Northwest Montana Fossils where much of our Two Medicine dinosaur material has been found.
A view of the Two Medicine Formation quarry operated by Northwest Montana Fossils where much of our Two Medicine dinosaur material has been found.

FOR SALE
$2,895
DETAILS
SPECIES
Hypacrosaurus sp.
LOCATION
Pondera County, Montana
FORMATION
Two Medicine Formation
SIZE
26.5 x 7", 26.7" tall on stand
CATEGORY
SUB CATEGORY
ITEM
#145229
GUARANTEE
We guarantee the authenticity of all of our
specimens. Read more about our
Authenticity Guarantee.