Authentic Green River Formation Fish Fossil – Kemmerer Wyoming Eocene Limestone

 A Real Fish from a 50-Million-Year-Old Prehistoric Lake

Age: Eocene, Around 50 million years ago

Location:  Green River Formation, Near Kemmerer, Wyoming

Specimen Size:  138mm x 82mm x 8.5mm Approximately)

Fish Size: 82mm x 37mm (approximately)

Weight: 206 grams

This genuine fish fossil from Kemmerer, Wyoming was discovered in a working quarry within the world-famous Green River Formation, one of the most remarkable fossil deposits on Earth. Around 50 million years ago during the Eocene Epoch, this region was covered by vast freshwater lakes where fish thrived in warm, calm waters surrounded by lush subtropical landscapes.

After the fish died, it settled gently to the lakebed and was quickly buried by extremely fine sediment. Low oxygen levels slowed decay and prevented scavengers from disturbing the remains, allowing delicate details of the skeleton and fins to be preserved. Over millions of years, these sediments hardened into fine-grained limestone, the characteristic rock of the Green River Formation, renowned worldwide for its exceptional fossil preservation.

Fossils from this formation are incredibly important because they provide one of the most detailed records of ancient freshwater ecosystems ever discovered. They help scientists understand prehistoric climate, lake environments, and the evolution of early fish and aquatic life, offering a remarkably clear snapshot of life in the Eocene world.

Bring home a beautifully preserved window into prehistoric lake life — add this authentic Green River fish fossil to your collection today!