Dual Species Green River Fish Fossil – Knightia & Diplomystus

Step back approximately 50 million years to the ancient waters of Fossil Lake in what is now Wyoming, USA. During the Eocene Epoch, this vast freshwater lake was home to thriving aquatic ecosystems filled with prehistoric fish, reptiles, plants, and early mammals. Today, the famous Green River Formation preserves one of the most detailed fossil records of ancient freshwater life ever discovered.

This extraordinary fossil fish plate features two iconic prehistoric fish species — Knightia eocaena and Diplomystus dentatus — beautifully preserved within fine-grained limestone. These fish once swam through the calm, warm waters of Fossil Lake before sinking to the lakebed, where ultra-fine sediment and low oxygen conditions protected their delicate remains from decay and scavengers.

The Green River Formation is internationally renowned for producing some of the world’s finest fossil fish specimens, often preserving intricate details such as scales, fins, vertebrae, and skeletal structures with remarkable clarity. Unlike many fossil deposits that yield fragmented remains, Fossil Lake fossils are frequently found fully articulated, creating stunning natural snapshots of prehistoric life frozen in time.

Knightia was one of the most abundant fish species in the lake, closely related to modern herring, while Diplomystus was a larger predatory fish that hunted smaller prey within the ecosystem. Together, these species help scientists reconstruct the complex food webs and environmental conditions of ancient Eocene lakes.

Carefully extracted and prepared by skilled fossil experts, this one-of-a-kind fossil fish plate is both a scientific treasure and a natural work of art — perfect for fossil collectors, educational displays, curiosity cabinets, and natural history décor.

The Details You Need

✓ SPECIMEN: Fossil Fish Plate
✓ SPECIES: Knightia eocaena & Diplomystus dentatus
✓ AGE: Eocene Epoch (Approx. 50 Million Years Old)
✓ FORMATION: Green River Formation
✓ LOCATION: Fossil Lake, Wyoming, USA
✓ SPECIMEN SIZE: 168mm x 115mm x 20mm Approximately
✓ WEIGHT: 1009 grams
✓ PRESERVATION: Natural fossil fish preserved in fine-grained limestone
✓ AUTHENTICITY: Genuine prehistoric freshwater fossil specimen
✓ DISPLAY: Ideal for fossil collections, educational displays, and natural history décor

Own a breathtaking snapshot of prehistoric freshwater life and let this remarkable fossil fish plate bring the ancient waters of Fossil Lake into your collection.