14.25" Fossil Fish (Gosiutichthys) Mortality Plate - Lake Gosiute
They appear very similar to the Knightia alta of Fossil Lake but were assigned to a different genus Gosiutichthys parvus. Personally they look like the exact same species to me, just the location and typical state of preservation is different.
The reason it's difficult to find fossil fish from Lake Gosiute is that the traditional collecting localities lies on BLM land which has been off limits to collecting for decades. This material comes from adjacent private land managed by the Rock Springs Grazing Association and was legally collected.