Fossilized Bone Fragment / Possible Gastrolith or Metapodial
Indeterminate vertebrate cf. Dinosauria • Vertebrate body fossil (likely petrified bone or heavily worn fossil fragment)
Geological Period
Mesozoic (likely Cretaceous or Jurassic based on common fossil bone finds)
Estimated Age
66 to 145 million years
Preservation Type
Permineralization and heavy aqueous abrasion/weathering
Condition Assessment
Fair; heavily water-worn and weathered, lacking fine anatomical diagnostic features
Taxonomic Classification
Phylum: Chordata, Subphylum: Vertebrata, Class: Reptilia (indeterminate)
Morphological Description
Elongated, sub-cylindrical to rectangular block with rounded, water-worn edges. Surface shows weathered texture with faint linear graining reminiscent of Haversian canals in bone, though heavily abraded.
Rock Matrix
Dense silicate or heavily mineralized sandstone/conglomerate matrix
Formation & Location
Alluvial deposits or river gravels globally; commonly found in formations like the Morrison Formation (USA) or similar terrestrial deposits
Size & Dimensions
Approximately 10-15 cm in length, consistent with medium-sized vertebrate limb bone fragments
Value & Rarity
Estimated Market Value
10 - 30 USD
Auction Estimate
5 - 20 USD
Rarity Assessment
Common
Scientific Significance
Provides general evidence of Mesozoic terrestrial vertebrate presence in the depositional environment, though limited taxonomically due to wear
Preparation Recommendations
No aggressive preparation needed; wash gently with water and a soft brush, store in a stable dry environment
Notable Features
Heavy rounding suggesting transport in a high-energy fluvial environment prior to final discovery