Potential Dinosaur Gastrolith
Unidentifiable specific taxon, classified generally as a vertebrate gastrolith • Trace fossil, gastrolith (stomach stone) of a vertebrate
Geological Period
Mesozoic Era (commonly Cretaceous or Jurassic)
Estimated Age
66 to 201 million years
Preservation Type
Whole rock weathering and aqueous/gastric polish; natural geological rounding enhanced by animal ingestion
Condition Assessment
Good condition; shows natural surface smoothing with minor weathering on one extremity, intact and solid
Taxonomic Classification
Ichnotaxon: Vertebrata (classificatory context depends on associated remains)
Morphological Description
Smooth, rounded, polished elongate stone with sub-cylindrical shape, blunted ends, and fine-grained texture showing signs of mechanical abrasion and polishing.
Rock Matrix
Dense igneous or metamorphic rock matrix, likely quartzite, basalt, or andesite with high silica content, highly resistant to weathering
Formation & Location
Found globally in Mesozoic continental red bed formations, Morrison Formation (USA), or equivalent fluvial/lacustrine deposits
Size & Dimensions
Approximately 10 to 15 cm in length, consistent with medium to large herbivorous dinosaur gastroliths
Value & Rarity
Estimated Market Value
20 to 50 USD
Auction Estimate
30 to 60 USD
Rarity Assessment
Common, though verified specimens with proven association to dinosaur skeletal remains are uncommon
Scientific Significance
Provides evidence of herbivorous dinosaur digestive behavior, diet, and paleogeographic transport mechanisms
Preparation Recommendations
No invasive preparation needed; gentle washing with water and mild detergent to remove surface dust. Store in a stable, dry environment.
Notable Features
High degree of polish typical of internal gastric milling, uniform texture, and elongated symmetrical shape.