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Top-down view of Knightia fossil fish preserved in pale cream limestone shale matrix, showing complete fish skeleton with fins, scales and spine in warm rust-brown mineral tones
Three-quarter view of Knightia Eocene fossil fish in limestone shale matrix showing full body detail including dorsal fin, lateral line and tail on yellow fabric surface
Reverse of Knightia fossil fish matrix held in hand showing plain pale cream and buff coloured limestone shale reverse with natural irregular edges
Extreme close-up of Knightia fossil fish head and body showing exceptional detail of skull, individual vertebrae, ribs and fin rays preserved in rust-brown mineral tones in limestone matrix
Fossil Fish – Knightia – Eocene Epoch – Green River Formation, Wyoming – c.50 Million Years Old
Full overhead view of Knightia fossil fish in pale cream limestone matrix on wooden surface, showing complete specimen with clearly preserved spine, scales, dorsal and pectoral fins and tail​​​​​​​​​​​​​​​​

Fossil Fish – Knightia – Eocene Epoch – Green River Formation, Wyoming – c.50 Million Years Old

A genuine and beautifully preserved fossil fish, Knightia sp., from the world-famous Green River Formation of Wyoming, USA. Dating to the Eocene epoch approximately 50 million years ago, this extinct genus of herring-like fish is one of the most commonly found vertebrate fossils in North America — yet each specimen is a genuinely thrilling object, a perfect snapshot of ancient life locked in stone.
This example is preserved in a pale cream limestone/shale matrix, with the full body of the fish clearly visible — spine, ribs, fins, scales and skull all beautifully defined in warm rust-brown mineral tones. The detail is exceptional, with the dorsal and pectoral fins, lateral line and individual vertebrae all clearly discernible.
The Green River Formation was once a vast network of subtropical freshwater lakes, and the fine-grained sediment that settled at its bottom created ideal conditions for extraordinary fossil preservation. Knightia specimens from this deposit are collected legally and have been traded internationally for decades.
A wonderful natural history piece — ideal as a display object, educational specimen, or an unusual and genuinely ancient gift.
• Species: Knightia sp. (extinct Eocene herring-like fish)
• Age: Approximately 50 million years (Eocene epoch)
• Origin: Green River Formation, Wyoming, USA
• Matrix: Limestone/shale
• Condition: Well preserved, excellent detail throughout