Reviews
16" Fossil Ceratopsid (Achelousaurus) Sacrum - Montana
This is an incredible, 16" long ceratopsid dinosaur (Achelousaurus horneri) sacrum, collected from our partner's private lease on the Two Medicine Formation in Pondera County, Montana. It consists of 5 fused vertebrae that make up the sacrum. Many of the processes are still intact, and the neural canal can be seen on both ends, though it's still packed with rock.
It sits nicely on a sturdy, custom metal display stand.
Restoration on this specimen is very minimal, primarily found as gap fill within repaired cracks through the transverse processes. The restoration makes up less than 2% of this specimen.
Achelousaurus is a genus of centrosaurine ceratopsid, a type of quadrupedal herbivore characterized by beaks, horns, frills and teeth at the back of their jaws. These dinosaurs lived in what is now North America during the Late Cretaceous period. Their fossils are dated back to roughly 74 million years ago, many of which have been recovered from Montana. They were herbivorous dinosaurs that sometimes reached 20 feet in length, with a full grown skull measuring 5 feet long.
It sits nicely on a sturdy, custom metal display stand.
Restoration on this specimen is very minimal, primarily found as gap fill within repaired cracks through the transverse processes. The restoration makes up less than 2% of this specimen.
Achelousaurus is a genus of centrosaurine ceratopsid, a type of quadrupedal herbivore characterized by beaks, horns, frills and teeth at the back of their jaws. These dinosaurs lived in what is now North America during the Late Cretaceous period. Their fossils are dated back to roughly 74 million years ago, many of which have been recovered from Montana. They were herbivorous dinosaurs that sometimes reached 20 feet in length, with a full grown skull measuring 5 feet long.
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.
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.
SPECIES
Achelousaurus horneri
LOCATION
Pondera County, Montana
FORMATION
Two Medicine Formation
SIZE
16 x 15.2"
CATEGORY
SUB CATEGORY
ITEM
#264988
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