Petrified Coprolite (Fossilized Dung)
Indeterminate vertebrate; possibly reptilian (crocodilian) or piscine based on morphology and inclusion texture • Trace fossil (Ichnofossil); non-mineralized organic waste
Geological Period
Likely Cretaceous to Eocene
Estimated Age
34 to 100 million years
Preservation Type
Permineralized and replaced; primarily silicified or phosphatic replacement (lithification)
Condition Assessment
Fair to Good; shows signs of water-worn weathering and surface abrasion, though its diagnostic cylindrical form remains intact
Taxonomic Classification
Kingdom: Animalia; Ichnogenus: Likely cf. Brachycoprus or similar undetermined vertebrate origin
Morphological Description
Elongated, sub-cylindrical shape with rounded ends. Surface exhibits a characteristic pitted, mottled texture with visible micro-inclusions that may represent undigested bone fragments or plant matter. The color varies from tan to dark brown due to mineral replacement.
Rock Matrix
None (isolated specimen); likely originated from a fine-grained sedimentary sequence such as mudstone or silty claystone
Formation & Location
Commonly found in the Hell Creek Formation (USA), the phosphate beds of Morocco, or the Isle of Wight (UK)
Size & Dimensions
Approximately 4-6 cm in length; consistent with waste from mid-sized Mesozoic or Cenozoic vertebrates
Value & Rarity
Estimated Market Value
$10.00 - $25.00 USD
Auction Estimate
$15.00 - $35.00 USD (natural history small-lot category)
Rarity Assessment
Common; while highly sought after by novelty collectors, coprolites are abundant in specific fossil-bearing strata worldwide
Scientific Significance
Provides critical data regarding ancient diets, digestive physiology, and trophic interactions within paleo-ecosystems. Identifies the presence of specific metabolic processes in extinct species.
Preparation Recommendations
Low-intervention. Dry cleaning with a soft brush; light application of Paraloid B-72 if surface flaking occurs. Store in a textile-lined box to prevent further abrasion.
Notable Features
Characteristic 'poop' shape with visible internal structure revealed by weathering; shows high degree of mineral replacement transforming organic matter into stone.