This listing is for a Knightia alta fossil fish, a well-preserved specimen from the Green River Formation, dating back to the Eocene Period (~50 million years ago). This fossil originates from Kemmerer, Wyoming, USA, a world-renowned site famous for its exceptional fossil preservation.
✔ 100% genuine and naturally preserved specimen
✔ Fine detail of scales, fins, and body structure
✔ Distinctive dark fossil contrast against light limestone matrix
✔ Highly collectible—ideal for display, study, or a unique gift
All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. The specimen shown in the photos is the exact fossil you will receive.
Knightia alta is an extinct species of herring-like fish that thrived in the Eocene freshwater lakes of North America. It is closely related to modern sardines and herrings, with a small, elongated body, densely packed scales, and distinctive fin placement.
The Green River Formation is world-famous for its exceptionally well-preserved fossils, which formed in ancient lakes around 50 million years ago. These fine-grained limestone deposits created ideal conditions for fossilisation, preserving fish with stunning anatomical detail.
This Knightia alta fossil is part of the Alice Purnell Collection, one of the largest and most respected fossil collections in the world. We specialise in museum-quality fossils, making this a perfect piece for collectors, educators, and researchers.
A stunning, naturally preserved Eocene fish fossil—own a genuine Knightia alta fossil from the Green River Formation today!