Confuciusornis
Confuciusornis sanctus • Body fossil (compression/carbonization); Vertebrate (Avialan)
Geological Period
Early Cretaceous (Barremian to Aptian)
Estimated Age
120 - 125 million years
Preservation Type
Lagerstätte-quality carbonization and mineral replacement; soft tissue (feathers) preserved as carbon films.
Condition Assessment
Very Good to Excellent; high degree of articulation, nearly complete skeletal structure, and clear feather impressions.
Taxonomic Classification
Phylum: Chordata, Class: Aves, Order: Confuciusornithiformes, Family: Confuciusornithidae, Genus: Confuciusornis
Morphological Description
Specimen exhibits a toothless beak (keratinous rhamphotheca), a pygostyle (fused tail vertebrae), and robust forelimbs with large claws. Visible carbonized halo indicates the presence of primary and secondary flight feathers. The sternum is large but lacks a deep keel. Skeletal articulation is high, with clear cervical vertebrae and distal limb elements.
Rock Matrix
Fine-grained tuffaceous siltstone and shale (Lagerstätte), typical of 'paper shale' lacustrine deposits.
Formation & Location
Yixian Formation (Jehol Biota), Liaoning Province, China.
Size & Dimensions
Approximately 20-30 cm in length; consistent with adult or sub-adult specimens of this genus.
Value & Rarity
Estimated Market Value
USD $5,000 - $15,000 (Note: Subject to strict Chinese export laws; legal status significantly affects value).
Auction Estimate
USD $8,000 - $20,000 at a specialized natural history auction.
Rarity Assessment
Uncommon; while many specimens have been found in the Jehol Biota, high-quality articulated specimens with soft tissue preservation are scientifically and commercially prized.
Scientific Significance
Key transitional fossil in avian evolution; represents one of the earliest birds to evolve a toothless beak and a pygostyle, illustrating the transition from long-tailed dinosaurs to modern birds.
Preparation Recommendations
Mechanical preparation under a microscope; consolidation with paraloid B-72. Must be kept in a climate-controlled environment to prevent shale delamination.
Notable Features
Features a distinct carbonaceous 'halo' of feathers; lack of long decorative tail feathers suggests this specimen may be a female (if sexual dimorphism theories for this species are correct).