A Mioplosus labracoides fossil fish slab from the Green River Formation at Kemmerer, Wyoming, USA, dated in the source record to the Lutetian stage of the Middle Eocene. The fish measures approximately 20.5 × 6.5 cm within a slab measuring 30.9 × 21.5 × 2.1 cm. The specimen weighs 2.875 kg. A distinctive natural history piece for a fossil collection or display. Display base not included.