Curved Fossilized Bone Fragment
Dinosauria indet. (insufficient diagnostic features for lower taxonomic assignment) • Vertebrate body fossil, specifically an incomplete limb bone or metapodial fragment
Geological Period
Cretaceous or Jurassic
Estimated Age
66 to 150 million years
Preservation Type
Permineralization with heavy iron oxide and silicate replacement
Condition Assessment
Poor to Fair; highly weathered, incomplete, missing all original articular ends, and heavily oxidized
Taxonomic Classification
Phylum: Chordata, Class: Reptilia, Clade: Dinosauria (Indeterminate)
Morphological Description
The specimen exhibits a distinctly curved, arch-like structure with rough, weathered cortical bone surfaces and a dense interior. There are no clearly visible articular surfaces, epiphyses, or diagnostic processes remaining due to heavy erosion and fragmentation.
Rock Matrix
Ironstone-rich sandstone and weathered sedimentary matrix
Formation & Location
Morrison Formation (USA) or equivalent terrestrial Cretaceous deposits globally
Size & Dimensions
Approximately 5 to 7 centimeters in maximum length, consistent with a small element or a fragment of a larger sub-adult or medium-sized dinosaur bone
Value & Rarity
Estimated Market Value
10 to 30 USD
Auction Estimate
15 to 40 USD
Rarity Assessment
Common (unidentifiable dinosaur bone fragments are frequently encountered in fossiliferous formations)
Scientific Significance
Provides local evidence of Mesozoic vertebrate presence and terrestrial depositional environments, though limited due to lack of anatomical context
Preparation Recommendations
Gentle mechanical cleaning with a soft brush to remove loose dirt. Avoid liquid washes if matrix is friable. Store in a stable, low-humidity environment.
Notable Features
Pronounced natural curvature resembling a bone cross-section or metapodial shaft fragment with deep reddish-brown weathering coloration