Fossilized Dinosaur Coprolite
Indeterminate vertebrate coprolite cf. Dinosauria • Trace fossil (coprolite), vertebrate origin
Geological Period
Mesozoic (Jurassic to Cretaceous)
Estimated Age
66 to 150 million years old
Preservation Type
Silicification and mineral permineralization with secondary iron and mineral replacement
Condition Assessment
Good condition; solid, intact nodule with natural surface weathering and smooth water-worn or wind-polished exterior
Taxonomic Classification
Ichnofamily Coprolithidae
Morphological Description
Elongated, cylindrical shape with rounded ends, showing smooth, weathered exterior contours and dense, compact internal structure visible through surface texture variations.
Rock Matrix
Fine-grained sandstone and mineralized silica matrix
Formation & Location
Morrison Formation (USA) or equivalent Mesozoic continental deposits
Size & Dimensions
Approximately 15 cm in length, consistent with medium to large herbivorous or carnivorous dinosaur coprolites
Value & Rarity
Estimated Market Value
$50 - $150
Auction Estimate
$75 - $200
Rarity Assessment
Common
Scientific Significance
Provides direct evidence of Mesozoic dietary habits, ancient predator-prey dynamics, and paleo-ecosystem trophic structures
Preparation Recommendations
No invasive preparation required; keep dry, clean gently with a soft brush, and store in a stable temperature environment
Notable Features
Distinct elongated, smooth cylindrical morphology characteristic of digested organic matter subjected to early mineral replacement