Eocene Fossil Fish Plate from the Green River Formation

Step back approximately 50 million years with this authentic Knightia eocaena Fish Fossil from the famous Green River Formation near Kemmerer, Wyoming. Dating to the Eocene Epoch, this beautifully preserved fossil offers an extraordinary glimpse into an ancient freshwater world that existed millions of years before humans ever walked the Earth.

During the Eocene, the Green River region was covered by vast subtropical lakes surrounded by lush vegetation and abundant wildlife. Knightia was one of the most common fish species inhabiting these calm freshwater environments, swimming in large schools through warm waters and feeding on small aquatic organisms. Closely related to modern herring and sardines, Knightia played an important role within this prehistoric lake ecosystem.

When this fish died, it sank to the quiet lakebed where it was rapidly buried beneath ultra-fine sediment. Low oxygen conditions prevented scavengers and decay, allowing delicate details such as scales, fins, and skeletal structures to remain exceptionally well preserved. Over millions of years, these sediments compressed and hardened into the fine-grained limestone that made the Green River Formation internationally renowned for its extraordinary fossil preservation.

Today, the Green River Formation is considered one of the world’s most scientifically important fossil localities, providing researchers with a remarkably detailed record of prehistoric freshwater ecosystems. Fossils from this region help scientists understand ancient climates, lake environments, and the evolution of early fish species while preserving a breathtaking snapshot of life during the Eocene Epoch.

This authentic Kemmerer fish fossil is more than a collector’s specimen — it is a genuine window into an ancient lake ecosystem preserved in stone for millions of years.

The Details You Need — Forever Gems Fossil Facts

✓ SPECIMEN: Fossil Fish
✓ SPECIES: Knightia eocaena
✓ AGE: Eocene Epoch (Approx. 50 Million Years Old)
✓ FORMATION: Green River Formation
✓ LOCATION: Near Kemmerer, Wyoming, USA
✓ SPECIMEN SIZE: 112mm x 78mm x 11mm Approximately
✓ FISH SIZE: 90mm x 40mm Approximately
✓ WEIGHT: 167 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

Bring home a perfectly preserved survivor from the ancient lakes of Wyoming and let this remarkable Knightia fossil become a timeless piece of Earth’s prehistoric history.