A finely preserved single Diplomystus fossil fish from the famous Green River Formation in Wyoming, USA, dating to the Eocene Epoch, around 50 million years ago.

This specimen shows the fish in a strong lateral profile, with the vertebral column, ribs, fin rays and tail structure clearly visible against the pale limestone matrix. The darker brown and golden mineral tones of the fossil create an attractive contrast with the surrounding rock and make the anatomical details especially easy to appreciate.

Diplomystus was a freshwater predatory fish that inhabited the ancient lakes of the Green River ecosystem. Its deeper body and distinctive skeletal structure make it immediately recognizable and especially appealing within collections of North American fossil fish.

The compact slab format makes this piece easy to display while still offering excellent visual impact, combining paleontological interest with the decorative beauty typical of Green River fossils.