Eocene Knightia Fish Fossil from Fossil Lake, Wyoming

Travel back approximately 50 million years with this authentic Knightia eocaena Fish Fossil from the world-famous Green River Formation near Kemmerer, Wyoming. Dating to the Eocene Epoch, this beautifully preserved fossil captures a remarkable moment from an ancient freshwater ecosystem that thrived millions of years before humans ever existed.

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 waters, swimming in large schools and feeding on small aquatic organisms. Closely related to modern herring and sardines, Knightia played a vital role within this prehistoric lake ecosystem.

This authentic fossil was discovered in a quarry approximately 20km outside Kemmerer, Wyoming — an area internationally celebrated for producing exceptionally preserved fossil fish. After the fish died, it drifted to the quiet lakebed where it was rapidly buried beneath ultra-fine sediment. Low oxygen conditions slowed decomposition and prevented scavengers from disturbing the remains, preserving delicate skeletal structures and anatomical details with extraordinary clarity.

Over millions of years, these sediments compressed and hardened into the fine-grained limestone that made the Green River Formation one of the most scientifically important fossil localities in the world. Fossils from this region provide researchers with an exceptionally detailed record of prehistoric freshwater ecosystems, helping scientists better understand ancient climates, lake environments, and the evolution of early fish species.

This authentic Knightia fossil is more than a collector’s specimen — it is a genuine relic from a prehistoric freshwater world 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: 116mm x 120mm x 9mm Approximately
✓ FISH SIZE: 98mm x 30mm Approximately
✓ WEIGHT: 261 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 genuine relic from Earth’s ancient freshwater past and let this beautifully preserved Knightia fossil become a timeless connection to the lakes of the Eocene world.