37" Huge, Adult Hadrosaur (Hypacrosaurus) Tibia Bone - Montana

Huge, Adult Hadrosaur (Hypacrosaurus) Tibia Bone - Montana #245513

Due to the size and weight of this piece it will be shipped on a pallet or in a crate via freight. Our website cannot automatically calculate freight shipping costs, so these costs will be calculated and billed after purchase. Please contact us prior to purchase if you need a shipping quote.

This is a beautifully preserved, 37" long adult hadrosaur (Hypacrosaurus sp.) tibia bone collected from the Two Medicine Formation of Montana. It was collected last summer from one of our partners's quarries in Pondera County, Montana. It comes from a hard sandstone layer and the bone quality is excellent and very dense. It is accompanied by the pictured custom metal display stand.

Measurements:
Length: 37" long
Proximal end: 9.3" wide
Distal end: 12.3" wide
On metal stand - 39.2" tall

It is in excellent condition with minimal restoration. The majority of the restoration on this bone can be found throughout the distal epiphysis where the bone was fairly fragmented. The proximal epiphysis has a large repaired crack with gap fill restoration within the crack, but is overall intact with minimal repair. The diaphysis has several repaired cracks which also required gap fill restoration in spots. This being said, restoration only makes up approximately 5% of this incredible specimen.

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

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.

More about Hadrosaurs