Description
Genuine Allosaurus fragilis Dinosaur Rib Bone Fragment Fossil
This listing is for a genuine Dinosaur Allosaurus fragilis rib bone fragment fossil from Utah, USA, supplied with a metal display stand. This highly collectable fossil comes from the famous Cleveland-Lloyd Dinosaur Quarry within the Morrison Formation and dates to the Upper Jurassic Period. It is a carefully chosen specimen with strong display appeal, ideal for collectors of dinosaur fossils, theropod bones, Jurassic fossils, Morrison Formation specimens, and authentic prehistoric natural history pieces.
The fossil shown in the photographs is the actual specimen you will receive. Full sizing and scale can be seen in the listing photos. Presented with a metal stand, this fossil makes an excellent display piece for a cabinet, desk, study, educational collection, museum-style arrangement, or natural history display.
Fossil Type, Species and Classification
Allosaurus fragilis was one of the dominant predatory dinosaurs of the Late Jurassic and is among the most famous theropods from North America. It was a large carnivorous dinosaur with powerful hind limbs, grasping forelimbs, sharp recurved teeth, and a lightweight skull adapted for predation. Allosaurus belongs to the order Saurischia, suborder Theropoda, and family Allosauridae.
The genus Allosaurus was formally named by Othniel Charles Marsh in 1877. The species Allosaurus fragilis is one of the best-known large meat-eating dinosaurs from the Morrison Formation and is especially associated with the Cleveland-Lloyd Dinosaur Quarry, where Allosaurus remains are particularly abundant.
This specimen represents a rib bone fragment, part of the skeletal structure that helped form and support the torso of the animal. Dinosaur rib bones are important anatomical elements, helping protect the chest and body cavity while contributing to the overall shape and strength of the skeleton. As a genuine fragment of theropod dinosaur bone, this fossil offers a direct connection to one of the most iconic Jurassic predators.
Cleveland-Lloyd Dinosaur Quarry, Utah, USA
The Cleveland-Lloyd Dinosaur Quarry in Utah is one of the most famous dinosaur fossil sites in the world. It is especially known for producing a large concentration of Allosaurus bones, making it one of the key localities for understanding this remarkable Jurassic predator. Fossils from this quarry are highly desirable because of their association with a classic and historically important dinosaur-bearing site.
The quarry is part of the Morrison Formation, a legendary geological unit that stretches across large parts of the western United States. The Morrison Formation has yielded many of the most recognisable Jurassic dinosaurs, including Allosaurus, Camarasaurus, Diplodocus, Apatosaurus, Stegosaurus, Ceratosaurus, and other prehistoric reptiles and vertebrates.
Upper Jurassic Geology and Ancient Environment
During the Upper Jurassic, the region that is now Utah formed part of a vast ancient landscape of river systems, floodplains, seasonal wetlands, lakes, ponds, and open lowland environments. Sediments of the Morrison Formation were laid down by ancient rivers and flood events, creating layers of sandstone, siltstone, mudstone, and clay-rich deposits that later preserved dinosaur remains.
The depositional environment of the Cleveland-Lloyd Dinosaur Quarry has long been studied because of its unusual concentration of dinosaur bones, particularly Allosaurus. The area is interpreted as part of a low-energy floodplain or pond-like setting where bones accumulated and were eventually buried in fine sediment. Over millions of years, mineral-rich groundwater moved through the buried remains, replacing and strengthening the original bone material through fossilisation.
Morphology and Display Features
This Allosaurus fragilis rib fragment preserves genuine fossilised dinosaur bone from a large Jurassic theropod. Rib fragments can show natural curvature, dense bone texture, internal structure, mineral staining, weathered edges, and surface features shaped by both the biology of the animal and the geological processes of preservation. As an authentic fossil specimen, it may display natural cracks, repairs, matrix traces, colour variation, surface wear, and irregularities consistent with genuine dinosaur bone.
The included metal stand enhances the presentation and allows the specimen to be displayed as a freestanding fossil. This makes it well suited for collectors who want an attractive and educational piece of dinosaur history from a classic American fossil locality.
Certificate of Authenticity
This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The certificate provides reassurance that the item is an authentic fossil specimen and not a modern replica or cast.
A Collectable Jurassic Predator Fossil
A genuine Allosaurus fragilis rib bone fragment from the Cleveland-Lloyd Dinosaur Quarry is a highly desirable addition to any fossil collection. It combines a famous carnivorous dinosaur species, a world-renowned Utah locality, the classic Morrison Formation, and an attractive metal display stand. This specimen is ideal for collectors of dinosaur bone, theropod fossils, Jurassic fossils, Allosaurus material, American dinosaur fossils, and authentic natural history display pieces.
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