An exceptional Diplomystus fossil fish from the world-famous Green River Formation, Wyoming, dating to the Eocene (~50 million years ago). This beautifully preserved specimen measures 28 cm and displays remarkable skeletal and fin detail across a fine-grained limestone slab.

Diplomystus dentatus was an extinct relative of modern herrings, known for its distinctive upturned jaw adapted for surface feeding. Fossils from the Green River Formation are celebrated for their exquisite preservation, capturing life in an ancient freshwater lake ecosystem.

This large, display-ready slab highlights the elegant anatomy of the fish—vertebrae, fin rays, and skull clearly visible—and makes a striking centerpiece for any fossil collection, museum, or educational display.

Origin: Green River Formation, Wyoming, USA
Age: Eocene (~50 million years)
Size: 28 cm fish length